805 lines
17 KiB
C++
805 lines
17 KiB
C++
/* thread.h: Locking and threading module definitions
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Copyright 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.
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Written by Marco Fuykschot <marco@ddi.nl>
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Major update 2001 Robert Collins <rbtcollins@hotmail.com>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef _CYGNUS_THREADS_
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#define _CYGNUS_THREADS_
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#define LOCK_FD_LIST 1
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#define LOCK_MEMORY_LIST 2
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#define LOCK_MMAP_LIST 3
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#define LOCK_DLL_LIST 4
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#define WRITE_LOCK 1
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#define READ_LOCK 2
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extern "C"
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{
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#if defined (_CYG_THREAD_FAILSAFE) && defined (_MT_SAFE)
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void AssertResourceOwner (int, int);
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#else
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#define AssertResourceOwner(i,ii)
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#endif
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}
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#ifndef _MT_SAFE
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#define SetResourceLock(i,n,c)
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#define ReleaseResourceLock(i,n,c)
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#else
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#include <pthread.h>
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#include <limits.h>
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#include <errno.h>
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#include <signal.h>
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#include <pwd.h>
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#include <grp.h>
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#include <security.h>
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#define _NOMNTENT_FUNCS
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#include <mntent.h>
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extern "C"
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{
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struct _winsup_t
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{
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/*
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Needed for the group functions
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*/
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struct __group16 _grp;
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char *_namearray[2];
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int _grp_pos;
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/* console.cc */
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unsigned _rarg;
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/* dlfcn.cc */
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int _dl_error;
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char _dl_buffer[256];
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/* passwd.cc */
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struct passwd _res;
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char _pass[_PASSWORD_LEN];
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int _pw_pos;
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/* path.cc */
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struct mntent mntbuf;
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int _iteration;
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DWORD available_drives;
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char mnt_type[80];
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char mnt_opts[80];
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char mnt_fsname[CYG_MAX_PATH];
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char mnt_dir[CYG_MAX_PATH];
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/* strerror */
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char _strerror_buf[20];
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/* sysloc.cc */
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char *_process_ident;
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int _process_logopt;
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int _process_facility;
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int _process_logmask;
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/* times.cc */
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char timezone_buf[20];
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struct tm _localtime_buf;
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/* uinfo.cc */
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char _username[UNLEN + 1];
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/* net.cc */
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char *_ntoa_buf;
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struct protoent *_protoent_buf;
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struct servent *_servent_buf;
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struct hostent *_hostent_buf;
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};
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struct __reent_t
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{
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struct _reent *_clib;
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struct _winsup_t *_winsup;
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void init_clib (_reent&);
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};
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_winsup_t *_reent_winsup ();
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void SetResourceLock (int, int, const char *) __attribute__ ((regparm (3)));
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void ReleaseResourceLock (int, int, const char *)
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__attribute__ ((regparm (3)));
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#ifdef _CYG_THREAD_FAILSAFE
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void AssertResourceOwner (int, int);
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#else
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#define AssertResourceOwner(i,ii)
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#endif
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}
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class fast_mutex
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{
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public:
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fast_mutex () :
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lock_counter (0), win32_obj_id (0)
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{
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}
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~fast_mutex ()
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{
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if(win32_obj_id)
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CloseHandle (win32_obj_id);
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}
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bool init ()
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{
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lock_counter = 0;
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win32_obj_id = ::CreateSemaphore (&sec_none_nih, 0, LONG_MAX, NULL);
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if (!win32_obj_id)
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{
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debug_printf ("CreateSemaphore failed. %E");
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return false;
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}
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return true;
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}
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void lock ()
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{
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if (InterlockedIncrement ((long *)&lock_counter) != 1)
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WaitForSingleObject (win32_obj_id, INFINITE);
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}
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void unlock ()
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{
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if (InterlockedDecrement ((long *)&lock_counter))
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::ReleaseSemaphore (win32_obj_id, 1, NULL);
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}
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private:
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unsigned long lock_counter;
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HANDLE win32_obj_id;
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};
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class per_process;
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class pinfo;
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class ResourceLocks
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{
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public:
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ResourceLocks ()
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{
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}
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LPCRITICAL_SECTION Lock (int);
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void Init ();
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void Delete ();
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#ifdef _CYG_THREAD_FAILSAFE
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DWORD owner;
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DWORD count;
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#endif
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private:
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CRITICAL_SECTION lock;
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bool inited;
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};
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#define PTHREAD_MAGIC 0xdf0df045
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#define PTHREAD_MUTEX_MAGIC PTHREAD_MAGIC+1
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#define PTHREAD_KEY_MAGIC PTHREAD_MAGIC+2
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#define PTHREAD_ATTR_MAGIC PTHREAD_MAGIC+3
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#define PTHREAD_MUTEXATTR_MAGIC PTHREAD_MAGIC+4
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#define PTHREAD_COND_MAGIC PTHREAD_MAGIC+5
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#define PTHREAD_CONDATTR_MAGIC PTHREAD_MAGIC+6
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#define SEM_MAGIC PTHREAD_MAGIC+7
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#define PTHREAD_ONCE_MAGIC PTHREAD_MAGIC+8
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#define PTHREAD_RWLOCK_MAGIC PTHREAD_MAGIC+9
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#define PTHREAD_RWLOCKATTR_MAGIC PTHREAD_MAGIC+10
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#define MUTEX_OWNER_ANONYMOUS ((pthread_t) -1)
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/* verifyable_object should not be defined here - it's a general purpose class */
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class verifyable_object
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{
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public:
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long magic;
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verifyable_object (long);
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virtual ~verifyable_object ();
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};
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typedef enum
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{
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VALID_OBJECT,
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INVALID_OBJECT,
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VALID_STATIC_OBJECT
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} verifyable_object_state;
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verifyable_object_state verifyable_object_isvalid (void const *, long);
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verifyable_object_state verifyable_object_isvalid (void const *, long, void *);
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template <class list_node> inline void
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List_insert (fast_mutex &mx, list_node *&head, list_node *node)
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{
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if (!node)
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return;
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mx.lock ();
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node->next = head;
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head = node;
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mx.unlock ();
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}
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template <class list_node> inline void
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List_remove (fast_mutex &mx, list_node *&head, list_node *node)
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{
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if (!node)
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return;
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mx.lock ();
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if (node == head)
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head = head->next;
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else if (head)
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{
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list_node *cur = head;
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while (cur->next && node != cur->next)
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cur = cur->next;
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if (node == cur->next)
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cur->next = cur->next->next;
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}
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mx.unlock ();
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}
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template <class list_node> class List
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{
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public:
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List() : head(NULL)
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{
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mx_init ();
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}
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~List()
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{
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}
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void fixup_after_fork ()
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{
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mx_init ();
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}
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void insert (list_node *node)
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{
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List_insert (mx, head, node);
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}
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void remove (list_node *node)
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{
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List_remove (mx, head, node);
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}
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void for_each (void (list_node::*callback) ())
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{
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mx.lock ();
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list_node *cur = head;
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while (cur)
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{
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(cur->*callback) ();
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cur = cur->next;
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}
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mx.unlock ();
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}
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protected:
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void mx_init ()
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{
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if (!mx.init ())
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api_fatal ("Could not create mutex for list synchronisation.");
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}
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fast_mutex mx;
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list_node *head;
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};
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class pthread_key:public verifyable_object
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{
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public:
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static bool is_good_object (pthread_key_t const *);
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DWORD tls_index;
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int set (const void *);
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void *get () const;
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pthread_key (void (*)(void *));
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~pthread_key ();
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static void fixup_before_fork ()
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{
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keys.for_each (&pthread_key::_fixup_before_fork);
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}
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static void fixup_after_fork ()
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{
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keys.fixup_after_fork ();
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keys.for_each (&pthread_key::_fixup_after_fork);
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}
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static void run_all_destructors ()
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{
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keys.for_each (&pthread_key::run_destructor);
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}
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/* List support calls */
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class pthread_key *next;
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private:
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static List<pthread_key> keys;
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void _fixup_before_fork ();
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void _fixup_after_fork ();
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void (*destructor) (void *);
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void run_destructor ();
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void *fork_buf;
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};
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class pthread_attr:public verifyable_object
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{
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public:
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static bool is_good_object(pthread_attr_t const *);
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int joinable;
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int contentionscope;
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int inheritsched;
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struct sched_param schedparam;
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size_t stacksize;
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pthread_attr ();
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~pthread_attr ();
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};
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class pthread_mutexattr:public verifyable_object
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{
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public:
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static bool is_good_object(pthread_mutexattr_t const *);
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int pshared;
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int mutextype;
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pthread_mutexattr ();
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~pthread_mutexattr ();
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};
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class pthread_mutex:public verifyable_object
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{
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public:
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static bool is_good_object (pthread_mutex_t const *);
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static bool is_good_initializer (pthread_mutex_t const *);
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static bool is_good_initializer_or_object (pthread_mutex_t const *);
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static bool is_good_initializer_or_bad_object (pthread_mutex_t const *mutex);
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static bool can_be_unlocked (pthread_mutex_t const *mutex);
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static void init_mutex ();
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static int init (pthread_mutex_t *, const pthread_mutexattr_t *);
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unsigned long lock_counter;
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HANDLE win32_obj_id;
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unsigned int recursion_counter;
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LONG condwaits;
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pthread_t owner;
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int type;
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int pshared;
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pthread_t get_pthread_self () const
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{
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return PTHREAD_MUTEX_NORMAL == type ? MUTEX_OWNER_ANONYMOUS :
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::pthread_self ();
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}
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int lock ()
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{
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return _lock (get_pthread_self ());
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}
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int trylock ()
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{
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return _trylock (get_pthread_self ());
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}
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int unlock ()
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{
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return _unlock (get_pthread_self ());
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}
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int destroy ()
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{
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return _destroy (get_pthread_self ());
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}
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void set_owner (pthread_t self)
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{
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recursion_counter = 1;
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owner = self;
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}
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int lock_recursive ()
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{
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if (UINT_MAX == recursion_counter)
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return EAGAIN;
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++recursion_counter;
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return 0;
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}
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pthread_mutex (pthread_mutexattr * = NULL);
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pthread_mutex (pthread_mutex_t *, pthread_mutexattr *);
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~pthread_mutex ();
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class pthread_mutex * next;
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static void fixup_after_fork ()
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{
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mutexes.fixup_after_fork ();
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mutexes.for_each (&pthread_mutex::_fixup_after_fork);
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}
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private:
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int _lock (pthread_t self);
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int _trylock (pthread_t self);
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int _unlock (pthread_t self);
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int _destroy (pthread_t self);
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void _fixup_after_fork ();
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static List<pthread_mutex> mutexes;
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static fast_mutex mutex_initialization_lock;
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};
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#define WAIT_CANCELED (WAIT_OBJECT_0 + 1)
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class pthread:public verifyable_object
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{
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public:
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HANDLE win32_obj_id;
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class pthread_attr attr;
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void *(*function) (void *);
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void *arg;
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void *return_ptr;
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bool valid;
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bool suspended;
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int cancelstate, canceltype;
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HANDLE cancel_event;
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pthread_t joiner;
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/* signal handling */
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struct sigaction *sigs;
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sigset_t *sigmask;
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LONG *sigtodo;
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virtual void create (void *(*)(void *), pthread_attr *, void *);
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pthread ();
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virtual ~pthread ();
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static void init_mainthread ();
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static bool is_good_object(pthread_t const *);
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static void atforkprepare();
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static void atforkparent();
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static void atforkchild();
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/* API calls */
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static int cancel (pthread_t);
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static int join (pthread_t * thread, void **return_val);
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static int detach (pthread_t * thread);
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static int create (pthread_t * thread, const pthread_attr_t * attr,
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void *(*start_routine) (void *), void *arg);
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static int once (pthread_once_t *, void (*)(void));
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static int atfork(void (*)(void), void (*)(void), void (*)(void));
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static int suspend (pthread_t * thread);
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static int resume (pthread_t * thread);
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virtual void exit (void *value_ptr);
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virtual int cancel ();
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virtual void testcancel ();
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static void static_cancel_self ();
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static DWORD cancelable_wait (HANDLE object, DWORD timeout, const bool do_cancel = true);
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virtual int setcancelstate (int state, int *oldstate);
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virtual int setcanceltype (int type, int *oldtype);
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virtual void push_cleanup_handler (__pthread_cleanup_handler *handler);
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virtual void pop_cleanup_handler (int const execute);
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static pthread* self ();
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static void *thread_init_wrapper (void *);
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virtual unsigned long getsequence_np();
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static int equal (pthread_t t1, pthread_t t2)
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{
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return t1 == t2;
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}
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/* List support calls */
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class pthread *next;
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static void fixup_after_fork ()
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{
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threads.fixup_after_fork ();
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threads.for_each (&pthread::_fixup_after_fork);
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}
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static void suspend_all_except_self ()
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{
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threads.for_each (&pthread::suspend_except_self);
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}
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static void resume_all ()
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{
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threads.for_each (&pthread::resume);
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}
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private:
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static List<pthread> threads;
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DWORD thread_id;
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__pthread_cleanup_handler *cleanup_stack;
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pthread_mutex mutex;
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void suspend_except_self ();
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void resume ();
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void _fixup_after_fork ();
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void pop_all_cleanup_handlers (void);
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void precreate (pthread_attr *);
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void postcreate ();
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void set_thread_id_to_current ();
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static void set_tls_self_pointer (pthread *);
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static pthread *get_tls_self_pointer ();
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void cancel_self ();
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DWORD get_thread_id ();
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void init_current_thread ();
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};
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class pthread_null : public pthread
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{
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public:
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static pthread *get_null_pthread();
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~pthread_null();
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/* From pthread These should never get called
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* as the ojbect is not verifyable
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*/
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void create (void *(*)(void *), pthread_attr *, void *);
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void exit (void *value_ptr);
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int cancel ();
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void testcancel ();
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int setcancelstate (int state, int *oldstate);
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int setcanceltype (int type, int *oldtype);
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void push_cleanup_handler (__pthread_cleanup_handler *handler);
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void pop_cleanup_handler (int const execute);
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unsigned long getsequence_np();
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private:
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pthread_null ();
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static pthread_null _instance;
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};
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class pthread_condattr:public verifyable_object
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{
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public:
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static bool is_good_object(pthread_condattr_t const *);
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int shared;
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pthread_condattr ();
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~pthread_condattr ();
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};
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class pthread_cond:public verifyable_object
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{
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public:
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static bool is_good_object (pthread_cond_t const *);
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static bool is_good_initializer (pthread_cond_t const *);
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static bool is_good_initializer_or_object (pthread_cond_t const *);
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static bool is_good_initializer_or_bad_object (pthread_cond_t const *);
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static void init_mutex ();
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static int init (pthread_cond_t *, const pthread_condattr_t *);
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|
|
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int shared;
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|
|
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unsigned long waiting;
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|
unsigned long pending;
|
|
HANDLE sem_wait;
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|
|
|
pthread_mutex mtx_in;
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|
pthread_mutex mtx_out;
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|
|
|
pthread_mutex_t mtx_cond;
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|
|
|
void unblock (const bool all);
|
|
int wait (pthread_mutex_t mutex, DWORD dwMilliseconds = INFINITE);
|
|
|
|
pthread_cond (pthread_condattr *);
|
|
~pthread_cond ();
|
|
|
|
class pthread_cond * next;
|
|
static void fixup_after_fork ()
|
|
{
|
|
conds.fixup_after_fork ();
|
|
conds.for_each (&pthread_cond::_fixup_after_fork);
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|
}
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|
|
|
private:
|
|
void _fixup_after_fork ();
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|
|
|
static List<pthread_cond> conds;
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|
static fast_mutex cond_initialization_lock;
|
|
};
|
|
|
|
class pthread_rwlockattr:public verifyable_object
|
|
{
|
|
public:
|
|
static bool is_good_object(pthread_rwlockattr_t const *);
|
|
int shared;
|
|
|
|
pthread_rwlockattr ();
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|
~pthread_rwlockattr ();
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|
};
|
|
|
|
class pthread_rwlock:public verifyable_object
|
|
{
|
|
public:
|
|
static bool is_good_object (pthread_rwlock_t const *);
|
|
static bool is_good_initializer (pthread_rwlock_t const *);
|
|
static bool is_good_initializer_or_object (pthread_rwlock_t const *);
|
|
static bool is_good_initializer_or_bad_object (pthread_rwlock_t const *);
|
|
static void init_mutex ();
|
|
static int init (pthread_rwlock_t *, const pthread_rwlockattr_t *);
|
|
|
|
int shared;
|
|
|
|
unsigned long waiting_readers;
|
|
unsigned long waiting_writers;
|
|
pthread_t writer;
|
|
struct RWLOCK_READER
|
|
{
|
|
struct RWLOCK_READER *next;
|
|
pthread_t thread;
|
|
} *readers;
|
|
fast_mutex readers_mx;
|
|
|
|
int rdlock ();
|
|
int tryrdlock ();
|
|
|
|
int wrlock ();
|
|
int trywrlock ();
|
|
|
|
int unlock ();
|
|
|
|
pthread_mutex mtx;
|
|
pthread_cond cond_readers;
|
|
pthread_cond cond_writers;
|
|
|
|
pthread_rwlock (pthread_rwlockattr *);
|
|
~pthread_rwlock ();
|
|
|
|
class pthread_rwlock * next;
|
|
static void fixup_after_fork ()
|
|
{
|
|
rwlocks.fixup_after_fork ();
|
|
rwlocks.for_each (&pthread_rwlock::_fixup_after_fork);
|
|
}
|
|
|
|
private:
|
|
static List<pthread_rwlock> rwlocks;
|
|
|
|
void add_reader (struct RWLOCK_READER *rd);
|
|
void remove_reader (struct RWLOCK_READER *rd);
|
|
struct RWLOCK_READER *lookup_reader (pthread_t thread);
|
|
|
|
void release ()
|
|
{
|
|
if (waiting_writers)
|
|
{
|
|
if (!readers)
|
|
cond_writers.unblock (false);
|
|
}
|
|
else if (waiting_readers)
|
|
cond_readers.unblock (true);
|
|
}
|
|
|
|
|
|
static void rdlock_cleanup (void *arg);
|
|
static void wrlock_cleanup (void *arg);
|
|
|
|
void _fixup_after_fork ();
|
|
|
|
static fast_mutex rwlock_initialization_lock;
|
|
};
|
|
|
|
class pthread_once
|
|
{
|
|
public:
|
|
pthread_mutex_t mutex;
|
|
int state;
|
|
};
|
|
|
|
/* shouldn't be here */
|
|
class semaphore:public verifyable_object
|
|
{
|
|
public:
|
|
static bool is_good_object(sem_t const *);
|
|
/* API calls */
|
|
static int init (sem_t * sem, int pshared, unsigned int value);
|
|
static int destroy (sem_t * sem);
|
|
static sem_t *open (const char *name, int oflag, mode_t mode,
|
|
unsigned int value);
|
|
static int wait (sem_t * sem);
|
|
static int post (sem_t * sem);
|
|
static int getvalue (sem_t * sem, int *sval);
|
|
static int trywait (sem_t * sem);
|
|
static int timedwait (sem_t * sem, const struct timespec *abstime);
|
|
|
|
HANDLE win32_obj_id;
|
|
int shared;
|
|
long currentvalue;
|
|
char *name;
|
|
|
|
semaphore (int, unsigned int);
|
|
semaphore (const char *name, int oflag, mode_t mode, unsigned int value);
|
|
~semaphore ();
|
|
|
|
class semaphore * next;
|
|
static void fixup_after_fork ()
|
|
{
|
|
semaphores.fixup_after_fork ();
|
|
semaphores.for_each (&semaphore::_fixup_after_fork);
|
|
}
|
|
|
|
private:
|
|
void _wait ();
|
|
void _post ();
|
|
int _getvalue (int *sval);
|
|
int _trywait ();
|
|
int _timedwait (const struct timespec *abstime);
|
|
|
|
void _fixup_after_fork ();
|
|
|
|
static List<semaphore> semaphores;
|
|
};
|
|
|
|
class callback
|
|
{
|
|
public:
|
|
void (*cb)(void);
|
|
class callback * next;
|
|
};
|
|
|
|
class MTinterface
|
|
{
|
|
public:
|
|
// General
|
|
int concurrency;
|
|
long int threadcount;
|
|
|
|
// Used for main thread data, and sigproc thread
|
|
struct __reent_t reents;
|
|
struct _winsup_t winsup_reent;
|
|
|
|
callback *pthread_prepare;
|
|
callback *pthread_child;
|
|
callback *pthread_parent;
|
|
|
|
pthread_key reent_key;
|
|
pthread_key thread_self_key;
|
|
|
|
void Init ();
|
|
void fixup_before_fork (void);
|
|
void fixup_after_fork (void);
|
|
|
|
MTinterface () :
|
|
concurrency (0), threadcount (1),
|
|
pthread_prepare (NULL), pthread_child (NULL), pthread_parent (NULL),
|
|
reent_key (NULL), thread_self_key (NULL)
|
|
{
|
|
}
|
|
};
|
|
|
|
#define MT_INTERFACE user_data->threadinterface
|
|
|
|
#endif // MT_SAFE
|
|
|
|
#endif // _CYGNUS_THREADS_
|