165 lines
3.5 KiB
C++
165 lines
3.5 KiB
C++
/* process.h
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Copyright 2001, 2002 Red Hat Inc.
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Written by 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 _PROCESS_H
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#define _PROCESS_H
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#include <assert.h>
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#include "threaded_queue.h"
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class process_cleanup : public queue_request
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{
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public:
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process_cleanup (class process *const theprocess)
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: _process (theprocess)
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{
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assert (_process);
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}
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virtual ~process_cleanup ();
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virtual void process ();
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private:
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class process *const _process;
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};
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class process;
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class cleanup_routine
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{
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friend class process;
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public:
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cleanup_routine (void *const key)
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: _key (key),
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_next (NULL)
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{}
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virtual ~cleanup_routine ();
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bool operator== (const cleanup_routine &rhs) const
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{
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return _key == rhs._key;
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}
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void *key () const { return _key; }
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/* MUST BE SYNCHRONOUS */
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virtual void cleanup (class process *) = 0;
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private:
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void *const _key;
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cleanup_routine *_next;
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};
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class process_cache;
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class process
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{
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friend class process_cache;
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friend class process_cleanup;
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public:
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process (pid_t cygpid, DWORD winpid);
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~process ();
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pid_t cygpid () const { return _cygpid; }
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DWORD winpid () const { return _winpid; }
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HANDLE handle () const { return _hProcess; }
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bool is_active () const { return _exit_status == STILL_ACTIVE; }
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void hold () { EnterCriticalSection (&_access); }
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void release () { LeaveCriticalSection (&_access); }
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bool add (cleanup_routine *);
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bool remove (const cleanup_routine *);
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private:
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const pid_t _cygpid;
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const DWORD _winpid;
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HANDLE _hProcess;
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long _cleaning_up;
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DWORD _exit_status; // Set in the constructor and in exit_code ().
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cleanup_routine *_routines_head;
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/* used to prevent races-on-delete */
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CRITICAL_SECTION _access;
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class process *_next;
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DWORD check_exit_code ();
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void cleanup ();
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};
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class process_cache
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{
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// Number of special (i.e., non-process) handles in _wait_array.
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// See wait_for_processes () and sync_wait_array () for details.
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enum {
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SPECIALS_COUNT = 2
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};
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class submission_loop : public queue_submission_loop
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{
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public:
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submission_loop (process_cache *const cache, threaded_queue *const queue)
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: queue_submission_loop (queue, true),
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_cache (cache)
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{
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assert (_cache);
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}
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private:
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process_cache *const _cache;
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virtual void request_loop ();
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};
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friend class submission_loop;
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public:
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process_cache (unsigned int initial_workers);
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~process_cache ();
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class process *process (pid_t cygpid, DWORD winpid);
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bool running () const { return _queue.running (); }
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bool start () { return _queue.start (); }
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bool stop () { return _queue.stop (); }
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private:
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threaded_queue _queue;
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submission_loop _submitter;
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size_t _processes_count;
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class process *_processes_head; // A list sorted by winpid.
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// Access to the _wait_array and related fields is not thread-safe,
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// since they are used solely by wait_for_processes () and its callees.
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HANDLE _wait_array[MAXIMUM_WAIT_OBJECTS];
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class process *_process_array[MAXIMUM_WAIT_OBJECTS];
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HANDLE _cache_add_trigger; // Actually both add and remove.
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CRITICAL_SECTION _cache_write_access; // Actually both read and write access.
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void wait_for_processes (HANDLE interrupt);
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size_t sync_wait_array (HANDLE interrupt);
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void check_and_remove_process (const size_t index);
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class process *find (DWORD winpid, class process **previous = NULL);
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};
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#endif /* _PROCESS_H */
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