2002-08-01 18:20:31 +02:00
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/* cygthread.cc
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2003-01-10 13:32:49 +01:00
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Copyright 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.
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2002-08-01 18:20:31 +02:00
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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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#include "winsup.h"
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2002-08-05 18:15:46 +02:00
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#include <windows.h>
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2002-08-29 05:33:50 +02:00
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#include <stdlib.h>
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2002-08-01 18:20:31 +02:00
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#include "exceptions.h"
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#include "security.h"
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#include "cygthread.h"
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2002-10-22 22:16:31 +02:00
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#include "sync.h"
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2002-12-11 05:00:04 +01:00
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#include "cygerrno.h"
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#include "sigproc.h"
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2003-12-03 06:21:55 +01:00
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#include "thread.h"
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#include "cygtls.h"
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2002-08-01 18:20:31 +02:00
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#undef CloseHandle
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2002-12-11 05:00:04 +01:00
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static cygthread NO_COPY threads[18];
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2002-08-01 18:20:31 +02:00
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#define NTHREADS (sizeof (threads) / sizeof (threads[0]))
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DWORD NO_COPY cygthread::main_thread_id;
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2002-10-22 22:16:31 +02:00
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bool NO_COPY cygthread::exiting;
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2002-08-29 05:33:50 +02:00
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2002-08-05 18:15:46 +02:00
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/* Initial stub called by cygthread constructor. Performs initial
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per-thread initialization and loops waiting for new thread functions
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to execute. */
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2002-08-01 18:20:31 +02:00
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DWORD WINAPI
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cygthread::stub (VOID *arg)
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2003-12-03 06:21:55 +01:00
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{
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2002-08-01 18:20:31 +02:00
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exception_list except_entry;
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/* Initialize this thread's ability to respond to things like
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SIGSEGV or SIGFPE. */
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init_exceptions (&except_entry);
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2003-12-05 06:29:17 +01:00
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_my_tls.remove (); // Remove me from signal chain -- not signalable.
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2003-12-03 06:21:55 +01:00
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2002-08-01 18:20:31 +02:00
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cygthread *info = (cygthread *) arg;
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2002-10-09 07:55:40 +02:00
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if (info->arg == cygself)
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2003-04-10 07:27:34 +02:00
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{
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if (info->ev)
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{
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CloseHandle (info->ev);
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CloseHandle (info->thread_sync);
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}
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2002-12-11 05:00:04 +01:00
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info->ev = info->thread_sync = info->stack_ptr = NULL;
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2003-04-10 07:27:34 +02:00
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}
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2002-10-09 07:55:40 +02:00
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else
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2002-10-13 20:16:33 +02:00
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{
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2003-04-11 04:16:17 +02:00
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info->stack_ptr = &arg;
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2003-04-10 07:27:34 +02:00
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if (!info->ev)
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{
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info->ev = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
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info->thread_sync = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
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}
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2002-10-13 20:16:33 +02:00
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}
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2002-08-01 18:20:31 +02:00
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while (1)
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{
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2002-10-14 04:37:49 +02:00
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if (!info->__name)
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2002-10-20 20:17:43 +02:00
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system_printf ("erroneous thread activation");
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2002-10-14 04:37:49 +02:00
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else
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{
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2002-10-22 22:16:31 +02:00
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if (!info->func || exiting)
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2003-12-14 08:09:22 +01:00
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return 0;
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2002-08-01 18:20:31 +02:00
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2002-10-14 04:37:49 +02:00
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/* Cygwin threads should not call ExitThread directly */
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info->func (info->arg == cygself ? info : info->arg);
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/* ...so the above should always return */
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2002-08-01 18:20:31 +02:00
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2002-08-06 07:08:55 +02:00
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#ifdef DEBUGGING
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2002-10-14 04:37:49 +02:00
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info->func = NULL; // catch erroneous activation
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2002-08-06 07:08:55 +02:00
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#endif
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2002-10-14 05:51:44 +02:00
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info->__name = NULL;
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2002-10-14 04:37:49 +02:00
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SetEvent (info->ev);
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}
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2002-10-13 20:16:33 +02:00
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switch (WaitForSingleObject (info->thread_sync, INFINITE))
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{
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case WAIT_OBJECT_0:
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continue;
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default:
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api_fatal ("WFSO failed, %E");
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break;
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}
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2002-08-01 18:20:31 +02:00
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}
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}
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2002-10-13 20:16:33 +02:00
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/* Overflow stub called by cygthread constructor. Calls specified function
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and then exits the thread. */
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DWORD WINAPI
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cygthread::simplestub (VOID *arg)
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2003-12-03 06:21:55 +01:00
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{
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2002-10-13 20:16:33 +02:00
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exception_list except_entry;
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/* Initialize this thread's ability to respond to things like
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SIGSEGV or SIGFPE. */
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init_exceptions (&except_entry);
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2003-12-05 06:29:17 +01:00
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_my_tls.remove (); // Remove me from signal chain -- not signalable.
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2002-10-13 20:16:33 +02:00
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cygthread *info = (cygthread *) arg;
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2003-04-11 04:16:17 +02:00
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info->stack_ptr = &arg;
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2003-12-05 06:29:17 +01:00
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info->ev = info->h;
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2002-10-13 20:16:33 +02:00
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info->func (info->arg == cygself ? info : info->arg);
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2003-12-14 08:09:22 +01:00
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return 0;
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2002-10-13 20:16:33 +02:00
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}
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2002-08-05 18:15:46 +02:00
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/* Start things going. Called from dll_crt0_1. */
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2002-08-01 18:20:31 +02:00
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void
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cygthread::init ()
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{
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main_thread_id = GetCurrentThreadId ();
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}
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bool
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cygthread::is ()
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{
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DWORD tid = GetCurrentThreadId ();
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for (DWORD i = 0; i < NTHREADS; i++)
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if (threads[i].id == tid)
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return 1;
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return 0;
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}
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2002-10-22 22:16:31 +02:00
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cygthread *
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2002-08-29 05:33:50 +02:00
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cygthread::freerange ()
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{
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cygthread *self = (cygthread *) calloc (1, sizeof (*self));
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self->is_freerange = true;
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2003-11-07 19:21:05 +01:00
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self->inuse = 1;
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2002-08-29 05:33:50 +02:00
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return self;
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}
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2002-08-01 18:20:31 +02:00
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void * cygthread::operator
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new (size_t)
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{
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2002-08-05 18:15:46 +02:00
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cygthread *info;
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2002-08-01 18:20:31 +02:00
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2002-10-22 22:16:31 +02:00
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/* Search the threads array for an empty slot to use */
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for (info = threads; info < threads + NTHREADS; info++)
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2003-04-10 07:27:34 +02:00
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if (!InterlockedExchange (&info->inuse, 1))
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2002-10-22 22:16:31 +02:00
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{
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2003-04-04 20:52:11 +02:00
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/* available */
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2002-08-06 07:08:55 +02:00
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#ifdef DEBUGGING
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2002-10-22 22:16:31 +02:00
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if (info->__name)
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2003-04-04 20:52:11 +02:00
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api_fatal ("name not NULL? id %p, i %d", info->id, info - threads);
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2002-08-06 07:08:55 +02:00
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#endif
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2002-10-22 22:16:31 +02:00
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goto out;
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}
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2002-09-29 04:19:35 +02:00
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2002-09-19 05:30:20 +02:00
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#ifdef DEBUGGING
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2002-10-22 22:16:31 +02:00
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char buf[1024];
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2003-04-04 20:52:11 +02:00
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if (!GetEnvironmentVariable ("CYGWIN_FREERANGE_NOCHECK", buf, sizeof (buf)))
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2002-10-22 22:16:31 +02:00
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api_fatal ("Overflowed cygwin thread pool");
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2003-11-07 19:21:05 +01:00
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else
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thread_printf ("Overflowed cygwin thread pool");
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2002-09-19 05:30:20 +02:00
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#endif
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2002-10-22 22:16:31 +02:00
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info = freerange (); /* exhausted thread pool */
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out:
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return info;
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2002-08-01 18:20:31 +02:00
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}
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cygthread::cygthread (LPTHREAD_START_ROUTINE start, LPVOID param,
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2003-04-10 07:27:34 +02:00
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const char *name): __name (name),
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func (start), arg (param)
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2002-08-01 18:20:31 +02:00
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{
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2002-08-06 07:08:55 +02:00
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thread_printf ("name %s, id %p", name, id);
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2003-04-10 07:27:34 +02:00
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if (h)
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2002-08-11 21:31:24 +02:00
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{
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2003-04-10 07:27:34 +02:00
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while (!thread_sync)
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low_priority_sleep (0);
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SetEvent (thread_sync);
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thread_printf ("activated thread_sync %p", thread_sync);
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2002-08-11 21:31:24 +02:00
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}
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2002-10-21 03:00:58 +02:00
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else
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2003-04-10 07:27:34 +02:00
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{
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2003-04-11 04:16:17 +02:00
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stack_ptr = NULL;
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2003-04-10 07:27:34 +02:00
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h = CreateThread (&sec_none_nih, 0, is_freerange ? simplestub : stub,
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this, 0, &id);
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if (!h)
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api_fatal ("thread handle not set - %p<%p>, %E", h, id);
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thread_printf ("created thread %p", h);
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}
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2002-08-01 18:20:31 +02:00
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}
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/* Return the symbolic name of the current thread for debugging.
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*/
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const char *
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cygthread::name (DWORD tid)
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{
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const char *res = NULL;
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if (!tid)
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tid = GetCurrentThreadId ();
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if (tid == main_thread_id)
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return "main";
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for (DWORD i = 0; i < NTHREADS; i++)
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if (threads[i].id == tid)
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{
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res = threads[i].__name ?: "exiting thread";
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break;
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}
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if (!res)
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{
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static char buf[30] NO_COPY = {0};
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__small_sprintf (buf, "unknown (%p)", tid);
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res = buf;
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}
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return res;
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}
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cygthread::operator
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HANDLE ()
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{
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while (!ev)
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2002-11-13 20:36:12 +01:00
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low_priority_sleep (0);
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2002-08-01 18:20:31 +02:00
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return ev;
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}
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2002-08-05 18:15:46 +02:00
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/* Should only be called when the process is exiting since it
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leaves an open thread slot. */
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2002-08-02 04:10:24 +02:00
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void
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cygthread::exit_thread ()
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{
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2002-08-29 05:33:50 +02:00
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if (!is_freerange)
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SetEvent (*this);
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2002-08-02 04:10:24 +02:00
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ExitThread (0);
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}
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2002-12-11 05:00:04 +01:00
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/* Forcibly terminate a thread. */
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void
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cygthread::terminate_thread ()
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{
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if (!is_freerange)
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2003-04-10 07:27:34 +02:00
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{
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ResetEvent (*this);
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ResetEvent (thread_sync);
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}
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2002-12-11 05:00:04 +01:00
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(void) TerminateThread (h, 0);
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(void) WaitForSingleObject (h, INFINITE);
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2003-04-10 07:27:34 +02:00
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CloseHandle (h);
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2003-04-11 04:16:17 +02:00
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while (!stack_ptr)
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low_priority_sleep (0);
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2002-12-11 05:00:04 +01:00
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MEMORY_BASIC_INFORMATION m;
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memset (&m, 0, sizeof (m));
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(void) VirtualQuery (stack_ptr, &m, sizeof m);
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2003-04-11 04:16:17 +02:00
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if (!m.RegionSize)
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system_printf ("m.RegionSize 0? stack_ptr %p", stack_ptr);
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else if (!VirtualFree (m.AllocationBase, 0, MEM_RELEASE))
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2003-06-05 21:18:33 +02:00
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debug_printf ("VirtualFree of allocation base %p<%p> failed, %E",
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2003-04-11 04:16:17 +02:00
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stack_ptr, m.AllocationBase);
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2002-12-11 05:00:04 +01:00
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2003-06-02 23:22:02 +02:00
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if (is_freerange)
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free (this);
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else
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{
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h = NULL;
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__name = NULL;
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stack_ptr = NULL;
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(void) InterlockedExchange (&inuse, 0); /* No longer in use */
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}
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2002-12-11 05:00:04 +01:00
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}
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2002-08-05 18:15:46 +02:00
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/* Detach the cygthread from the current thread. Note that the
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2002-10-13 20:16:33 +02:00
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theory is that cygthreads are only associated with one thread.
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2003-04-04 20:52:11 +02:00
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So, there should be never be multiple threads doing waits
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on the same cygthread. */
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2002-12-14 05:01:32 +01:00
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bool
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cygthread::detach (HANDLE sigwait)
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2002-08-01 18:20:31 +02:00
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{
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2002-12-14 05:01:32 +01:00
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bool signalled = false;
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2003-04-10 07:27:34 +02:00
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if (!inuse)
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system_printf ("called detach but inuse %d, thread %p?", inuse, id);
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2002-08-06 07:08:55 +02:00
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else
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2002-08-01 18:20:31 +02:00
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{
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2002-12-11 05:00:04 +01:00
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DWORD res;
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2002-12-14 05:01:32 +01:00
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if (!sigwait)
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2002-12-11 05:00:04 +01:00
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res = WaitForSingleObject (*this, INFINITE);
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else
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{
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HANDLE w4[2];
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2003-05-09 19:56:58 +02:00
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w4[0] = *this;
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w4[1] = signal_arrived;
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2002-12-14 05:01:32 +01:00
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res = WaitForSingleObject (sigwait, INFINITE);
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if (res != WAIT_OBJECT_0)
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2003-02-27 16:09:31 +01:00
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system_printf ("WFSO sigwait %p failed, res %u, %E", sigwait, res);
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2002-12-11 05:00:04 +01:00
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res = WaitForMultipleObjects (2, w4, FALSE, INFINITE);
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2003-05-09 19:56:58 +02:00
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if (res == WAIT_OBJECT_0)
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2002-12-14 05:01:32 +01:00
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/* nothing */;
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2003-05-09 19:56:58 +02:00
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else if (WaitForSingleObject (sigwait, 0) == WAIT_OBJECT_0)
|
2002-12-14 05:01:32 +01:00
|
|
|
res = WaitForSingleObject (*this, INFINITE);
|
2003-05-09 19:56:58 +02:00
|
|
|
else if ((res = WaitForSingleObject (*this, 0)) != WAIT_OBJECT_0)
|
2002-12-11 05:00:04 +01:00
|
|
|
{
|
2003-04-04 20:52:11 +02:00
|
|
|
signalled = true;
|
2002-12-11 05:00:04 +01:00
|
|
|
terminate_thread ();
|
2002-12-25 18:43:37 +01:00
|
|
|
set_sig_errno (EINTR); /* caller should be dealing with return
|
2002-12-11 05:00:04 +01:00
|
|
|
values. */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2002-12-14 05:01:32 +01:00
|
|
|
thread_printf ("%s returns %d, id %p", sigwait ? "WFMO" : "WFSO",
|
2002-12-11 05:00:04 +01:00
|
|
|
res, id);
|
2002-10-21 03:00:58 +02:00
|
|
|
|
2003-04-04 20:52:11 +02:00
|
|
|
if (signalled)
|
2002-12-11 05:00:04 +01:00
|
|
|
/* already handled */;
|
|
|
|
else if (is_freerange)
|
2002-08-29 05:33:50 +02:00
|
|
|
{
|
|
|
|
CloseHandle (h);
|
|
|
|
free (this);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2002-10-21 03:00:58 +02:00
|
|
|
ResetEvent (*this);
|
2003-04-10 07:27:34 +02:00
|
|
|
/* Mark the thread as available by setting inuse to zero */
|
|
|
|
(void) InterlockedExchange (&inuse, 0);
|
2002-08-29 05:33:50 +02:00
|
|
|
}
|
2002-08-01 18:20:31 +02:00
|
|
|
}
|
2002-12-14 05:01:32 +01:00
|
|
|
return signalled;
|
2002-08-01 18:20:31 +02:00
|
|
|
}
|
2002-09-29 04:19:35 +02:00
|
|
|
|
|
|
|
void
|
|
|
|
cygthread::terminate ()
|
|
|
|
{
|
2002-10-22 22:16:31 +02:00
|
|
|
exiting = 1;
|
2002-09-29 04:19:35 +02:00
|
|
|
}
|