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https://github.com/reactos/wine.git
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582 lines
17 KiB
C
582 lines
17 KiB
C
/*
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* pthread emulation for re-entrant libcs
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*
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* Copyright 1999 Ove Kåven
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* Copyright 2003 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#ifdef HAVE_PTHREAD_H
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#define _GNU_SOURCE /* we may need to override some GNU extensions */
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#include <assert.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <setjmp.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <string.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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# include <sys/socket.h>
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#endif
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#include "windef.h"
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#include "winbase.h"
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#include "winternl.h"
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#include "kernel_private.h"
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#include "wine/pthread.h"
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#define P_OUTPUT(stuff) write(2,stuff,strlen(stuff))
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/* NOTE: This is a truly extremely incredibly ugly hack!
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* But it does seem to work... */
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/* assume that pthread_mutex_t has room for at least one pointer,
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* and hope that the users of pthread_mutex_t considers it opaque
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* (never checks what's in it)
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* also: assume that static initializer sets pointer to NULL
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*/
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typedef struct
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{
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#ifdef __GLIBC__
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int reserved;
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#endif
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CRITICAL_SECTION *critsect;
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} *wine_mutex;
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/* see wine_mutex above for comments */
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typedef struct {
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RTL_RWLOCK *lock;
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} *wine_rwlock;
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struct pthread_thread_init
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{
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void* (*start_routine)(void*);
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void* arg;
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};
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static DWORD CALLBACK pthread_thread_start(LPVOID data)
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{
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struct pthread_thread_init init = *(struct pthread_thread_init*)data;
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HeapFree(GetProcessHeap(),0,data);
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return (DWORD)init.start_routine(init.arg);
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}
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static int wine_pthread_create(pthread_t* thread, const pthread_attr_t* attr, void*
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(*start_routine)(void *), void* arg)
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{
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HANDLE hThread;
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struct pthread_thread_init* idata = HeapAlloc(GetProcessHeap(), 0, sizeof(struct pthread_thread_init));
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idata->start_routine = start_routine;
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idata->arg = arg;
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hThread = CreateThread( NULL, 0, pthread_thread_start, idata, 0, (LPDWORD)thread);
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if(hThread)
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CloseHandle(hThread);
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else
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{
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HeapFree(GetProcessHeap(),0,idata); /* free idata struct on failure */
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return EAGAIN;
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}
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return 0;
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}
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static int wine_pthread_cancel(pthread_t thread)
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{
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HANDLE hThread = OpenThread(THREAD_ALL_ACCESS, FALSE, (DWORD)thread);
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if(!TerminateThread(hThread, 0))
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{
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CloseHandle(hThread);
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return EINVAL; /* return error */
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}
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CloseHandle(hThread);
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return 0; /* return success */
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}
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static int wine_pthread_join(pthread_t thread, void **value_ptr)
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{
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HANDLE hThread = OpenThread(THREAD_ALL_ACCESS, FALSE, (DWORD)thread);
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WaitForSingleObject(hThread, INFINITE);
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if(!GetExitCodeThread(hThread, (LPDWORD)value_ptr))
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{
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CloseHandle(hThread);
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return EINVAL; /* FIXME: make this more correctly match */
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} /* windows errors */
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CloseHandle(hThread);
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return 0;
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}
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/*FIXME: not sure what to do with this one... */
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static int wine_pthread_detach(pthread_t thread)
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{
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P_OUTPUT("FIXME:pthread_detach\n");
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return 0;
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}
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/***** MUTEXES *****/
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static int wine_pthread_mutex_init(pthread_mutex_t *mutex,
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const pthread_mutexattr_t *mutexattr)
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{
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/* glibc has a tendency to initialize mutexes very often, even
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in situations where they are not really used later on.
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As for us, initializing a mutex is very expensive, we postpone
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the real initialization until the time the mutex is first used. */
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((wine_mutex)mutex)->critsect = NULL;
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return 0;
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}
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static void mutex_real_init( pthread_mutex_t *mutex )
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{
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CRITICAL_SECTION *critsect = HeapAlloc(GetProcessHeap(), 0, sizeof(CRITICAL_SECTION));
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RtlInitializeCriticalSection(critsect);
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if (InterlockedCompareExchangePointer((void**)&(((wine_mutex)mutex)->critsect),critsect,NULL) != NULL) {
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/* too late, some other thread already did it */
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RtlDeleteCriticalSection(critsect);
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HeapFree(GetProcessHeap(), 0, critsect);
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}
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}
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static int wine_pthread_mutex_lock(pthread_mutex_t *mutex)
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{
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if (!((wine_mutex)mutex)->critsect)
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mutex_real_init( mutex );
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RtlEnterCriticalSection(((wine_mutex)mutex)->critsect);
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return 0;
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}
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static int wine_pthread_mutex_trylock(pthread_mutex_t *mutex)
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{
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if (!((wine_mutex)mutex)->critsect)
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mutex_real_init( mutex );
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if (!RtlTryEnterCriticalSection(((wine_mutex)mutex)->critsect)) return EBUSY;
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return 0;
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}
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static int wine_pthread_mutex_unlock(pthread_mutex_t *mutex)
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{
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CRITICAL_SECTION *crit = ((wine_mutex)mutex)->critsect;
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if (!crit) return 0;
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if (crit->OwningThread != (HANDLE)GetCurrentThreadId()) return EPERM;
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RtlLeaveCriticalSection( crit );
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return 0;
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}
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static int wine_pthread_mutex_destroy(pthread_mutex_t *mutex)
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{
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if (!((wine_mutex)mutex)->critsect) return 0;
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if (((wine_mutex)mutex)->critsect->RecursionCount) {
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#if 0 /* there seems to be a bug in libc6 that makes this a bad idea */
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return EBUSY;
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#else
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while (((wine_mutex)mutex)->critsect->RecursionCount)
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RtlLeaveCriticalSection(((wine_mutex)mutex)->critsect);
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#endif
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}
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RtlDeleteCriticalSection(((wine_mutex)mutex)->critsect);
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HeapFree(GetProcessHeap(), 0, ((wine_mutex)mutex)->critsect);
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((wine_mutex)mutex)->critsect = NULL;
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return 0;
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}
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/***** READ-WRITE LOCKS *****/
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static void rwlock_real_init(pthread_rwlock_t *rwlock)
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{
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RTL_RWLOCK *lock = HeapAlloc(GetProcessHeap(), 0, sizeof(RTL_RWLOCK));
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RtlInitializeResource(lock);
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if (InterlockedCompareExchangePointer((void**)&(((wine_rwlock)rwlock)->lock),lock,NULL) != NULL) {
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/* too late, some other thread already did it */
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RtlDeleteResource(lock);
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HeapFree(GetProcessHeap(), 0, lock);
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}
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}
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static int wine_pthread_rwlock_init(pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *rwlock_attr)
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{
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((wine_rwlock)rwlock)->lock = NULL;
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return 0;
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}
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static int wine_pthread_rwlock_destroy(pthread_rwlock_t *rwlock)
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{
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if (!((wine_rwlock)rwlock)->lock) return 0;
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RtlDeleteResource(((wine_rwlock)rwlock)->lock);
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HeapFree(GetProcessHeap(), 0, ((wine_rwlock)rwlock)->lock);
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return 0;
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}
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static int wine_pthread_rwlock_rdlock(pthread_rwlock_t *rwlock)
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{
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if (!((wine_rwlock)rwlock)->lock)
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rwlock_real_init( rwlock );
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while(TRUE)
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if (RtlAcquireResourceShared(((wine_rwlock)rwlock)->lock, TRUE))
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return 0;
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}
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static int wine_pthread_rwlock_tryrdlock(pthread_rwlock_t *rwlock)
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{
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if (!((wine_rwlock)rwlock)->lock)
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rwlock_real_init( rwlock );
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if (!RtlAcquireResourceShared(((wine_rwlock)rwlock)->lock, FALSE)) return EBUSY;
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return 0;
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}
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static int wine_pthread_rwlock_wrlock(pthread_rwlock_t *rwlock)
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{
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if (!((wine_rwlock)rwlock)->lock)
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rwlock_real_init( rwlock );
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while(TRUE)
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if (RtlAcquireResourceExclusive(((wine_rwlock)rwlock)->lock, TRUE))
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return 0;
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}
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static int wine_pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock)
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{
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if (!((wine_rwlock)rwlock)->lock)
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rwlock_real_init( rwlock );
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if (!RtlAcquireResourceExclusive(((wine_rwlock)rwlock)->lock, FALSE)) return EBUSY;
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return 0;
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}
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static int wine_pthread_rwlock_unlock(pthread_rwlock_t *rwlock)
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{
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if (!((wine_rwlock)rwlock)->lock) return 0;
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RtlReleaseResource( ((wine_rwlock)rwlock)->lock );
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return 0;
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}
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/***** CONDITIONS *****/
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/* The condition code is basically cut-and-pasted from Douglas
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* Schmidt's paper:
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* "Strategies for Implementing POSIX Condition Variables on Win32",
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* at http://www.cs.wustl.edu/~schmidt/win32-cv-1.html and
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* http://www.cs.wustl.edu/~schmidt/win32-cv-2.html.
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* This paper formed the basis for the condition variable
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* impementation used in the ACE library.
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*/
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/* Possible problems with ACE:
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* - unimplemented pthread_mutexattr_init
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*/
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typedef struct {
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/* Number of waiting threads. */
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int waiters_count;
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/* Serialize access to <waiters_count>. */
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CRITICAL_SECTION waiters_count_lock;
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/*
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* Semaphore used to queue up threads waiting for the condition to
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* become signaled.
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*/
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HANDLE sema;
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/*
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* An auto-reset event used by the broadcast/signal thread to wait
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* for all the waiting thread(s) to wake up and be released from the
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* semaphore.
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*/
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HANDLE waiters_done;
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/*
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* Keeps track of whether we were broadcasting or signaling. This
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* allows us to optimize the code if we're just signaling.
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*/
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size_t was_broadcast;
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} wine_cond_detail;
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/* see wine_mutex above for comments */
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typedef struct {
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wine_cond_detail *cond;
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} *wine_cond;
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static void wine_cond_real_init(pthread_cond_t *cond)
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{
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wine_cond_detail *detail = HeapAlloc(GetProcessHeap(), 0, sizeof(wine_cond_detail));
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detail->waiters_count = 0;
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detail->was_broadcast = 0;
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detail->sema = CreateSemaphoreW( NULL, 0, 0x7fffffff, NULL );
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detail->waiters_done = CreateEventW( NULL, FALSE, FALSE, NULL );
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RtlInitializeCriticalSection (&detail->waiters_count_lock);
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if (InterlockedCompareExchangePointer((void**)&(((wine_cond)cond)->cond), detail, NULL) != NULL)
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{
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/* too late, some other thread already did it */
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P_OUTPUT("FIXME:pthread_cond_init:expect troubles...\n");
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CloseHandle(detail->sema);
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RtlDeleteCriticalSection(&detail->waiters_count_lock);
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CloseHandle(detail->waiters_done);
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HeapFree(GetProcessHeap(), 0, detail);
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}
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}
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static int wine_pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *cond_attr)
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{
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/* The same as for wine_pthread_mutex_init, we postpone initialization
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until condition is really used.*/
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((wine_cond)cond)->cond = NULL;
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return 0;
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}
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static int wine_pthread_cond_destroy(pthread_cond_t *cond)
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{
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wine_cond_detail *detail = ((wine_cond)cond)->cond;
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if (!detail) return 0;
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CloseHandle(detail->sema);
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RtlDeleteCriticalSection(&detail->waiters_count_lock);
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CloseHandle(detail->waiters_done);
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HeapFree(GetProcessHeap(), 0, detail);
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((wine_cond)cond)->cond = NULL;
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return 0;
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}
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static int wine_pthread_cond_signal(pthread_cond_t *cond)
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{
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int have_waiters;
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wine_cond_detail *detail;
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if ( !((wine_cond)cond)->cond ) wine_cond_real_init(cond);
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detail = ((wine_cond)cond)->cond;
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RtlEnterCriticalSection (&detail->waiters_count_lock);
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have_waiters = detail->waiters_count > 0;
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RtlLeaveCriticalSection (&detail->waiters_count_lock);
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/* If there aren't any waiters, then this is a no-op. */
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if (have_waiters)
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ReleaseSemaphore(detail->sema, 1, NULL);
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return 0;
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}
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static int wine_pthread_cond_broadcast(pthread_cond_t *cond)
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{
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int have_waiters = 0;
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wine_cond_detail *detail;
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if ( !((wine_cond)cond)->cond ) wine_cond_real_init(cond);
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detail = ((wine_cond)cond)->cond;
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/*
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* This is needed to ensure that <waiters_count> and <was_broadcast> are
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* consistent relative to each other.
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*/
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RtlEnterCriticalSection (&detail->waiters_count_lock);
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if (detail->waiters_count > 0) {
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/*
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* We are broadcasting, even if there is just one waiter...
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* Record that we are broadcasting, which helps optimize
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* <pthread_cond_wait> for the non-broadcast case.
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*/
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detail->was_broadcast = 1;
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have_waiters = 1;
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}
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if (have_waiters) {
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/* Wake up all the waiters atomically. */
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ReleaseSemaphore(detail->sema, detail->waiters_count, NULL);
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RtlLeaveCriticalSection (&detail->waiters_count_lock);
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/* Wait for all the awakened threads to acquire the counting semaphore. */
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WaitForSingleObject (detail->waiters_done, INFINITE);
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/*
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* This assignment is okay, even without the <waiters_count_lock> held
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* because no other waiter threads can wake up to access it.
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*/
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detail->was_broadcast = 0;
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}
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else
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RtlLeaveCriticalSection (&detail->waiters_count_lock);
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return 0;
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}
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static int wine_pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
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{
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wine_cond_detail *detail;
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int last_waiter;
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if ( !((wine_cond)cond)->cond ) wine_cond_real_init(cond);
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detail = ((wine_cond)cond)->cond;
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/* Avoid race conditions. */
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RtlEnterCriticalSection (&detail->waiters_count_lock);
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detail->waiters_count++;
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RtlLeaveCriticalSection (&detail->waiters_count_lock);
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RtlLeaveCriticalSection ( ((wine_mutex)mutex)->critsect );
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WaitForSingleObject(detail->sema, INFINITE);
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/* Reacquire lock to avoid race conditions. */
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RtlEnterCriticalSection (&detail->waiters_count_lock);
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/* We're no longer waiting... */
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detail->waiters_count--;
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/* Check to see if we're the last waiter after <pthread_cond_broadcast>. */
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last_waiter = detail->was_broadcast && detail->waiters_count == 0;
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RtlLeaveCriticalSection (&detail->waiters_count_lock);
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/*
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* If we're the last waiter thread during this particular broadcast
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* then let all the other threads proceed.
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*/
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if (last_waiter) SetEvent(detail->waiters_done);
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RtlEnterCriticalSection (((wine_mutex)mutex)->critsect);
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return 0;
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}
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static int wine_pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
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const struct timespec *abstime)
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{
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DWORD ms = abstime->tv_sec * 1000 + abstime->tv_nsec / 1000000;
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int last_waiter;
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wine_cond_detail *detail;
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if ( !((wine_cond)cond)->cond ) wine_cond_real_init(cond);
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detail = ((wine_cond)cond)->cond;
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/* Avoid race conditions. */
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RtlEnterCriticalSection (&detail->waiters_count_lock);
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detail->waiters_count++;
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RtlLeaveCriticalSection (&detail->waiters_count_lock);
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RtlLeaveCriticalSection (((wine_mutex)mutex)->critsect);
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WaitForSingleObject (detail->sema, ms);
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/* Reacquire lock to avoid race conditions. */
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RtlEnterCriticalSection (&detail->waiters_count_lock);
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/* We're no longer waiting... */
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detail->waiters_count--;
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/* Check to see if we're the last waiter after <pthread_cond_broadcast>. */
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last_waiter = detail->was_broadcast && detail->waiters_count == 0;
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RtlLeaveCriticalSection (&detail->waiters_count_lock);
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/*
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* If we're the last waiter thread during this particular broadcast
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* then let all the other threads proceed.
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*/
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if (last_waiter) SetEvent (detail->waiters_done);
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RtlEnterCriticalSection (((wine_mutex)mutex)->critsect);
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return 0;
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}
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/***** MISC *****/
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static pthread_t wine_pthread_self(void)
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{
|
|
return (pthread_t)GetCurrentThreadId();
|
|
}
|
|
|
|
static int wine_pthread_equal(pthread_t thread1, pthread_t thread2)
|
|
{
|
|
return (DWORD)thread1 == (DWORD)thread2;
|
|
}
|
|
|
|
static void wine_pthread_exit(void *retval, char *currentframe)
|
|
{
|
|
ExitThread((DWORD)retval);
|
|
}
|
|
|
|
static void *wine_get_thread_data(void)
|
|
{
|
|
return kernel_get_thread_data()->pthread_data;
|
|
}
|
|
|
|
static void wine_set_thread_data( void *data )
|
|
{
|
|
kernel_get_thread_data()->pthread_data = data;
|
|
}
|
|
|
|
static const struct wine_pthread_callbacks callbacks =
|
|
{
|
|
wine_get_thread_data, /* ptr_get_thread_data */
|
|
wine_set_thread_data, /* ptr_set_thread_data */
|
|
wine_pthread_self, /* ptr_pthread_self */
|
|
wine_pthread_equal, /* ptr_pthread_equal */
|
|
wine_pthread_create, /* ptr_pthread_create */
|
|
wine_pthread_cancel, /* ptr_pthread_cancel */
|
|
wine_pthread_join, /* ptr_pthread_join */
|
|
wine_pthread_detach, /* ptr_pthread_detach */
|
|
wine_pthread_exit, /* ptr_pthread_exit */
|
|
wine_pthread_mutex_init, /* ptr_pthread_mutex_init */
|
|
wine_pthread_mutex_lock, /* ptr_pthread_mutex_lock */
|
|
wine_pthread_mutex_trylock, /* ptr_pthread_mutex_trylock */
|
|
wine_pthread_mutex_unlock, /* ptr_pthread_mutex_unlock */
|
|
wine_pthread_mutex_destroy, /* ptr_pthread_mutex_destroy */
|
|
wine_pthread_rwlock_init, /* ptr_pthread_rwlock_init */
|
|
wine_pthread_rwlock_destroy, /* ptr_pthread_rwlock_destroy */
|
|
wine_pthread_rwlock_rdlock, /* ptr_pthread_rwlock_rdlock */
|
|
wine_pthread_rwlock_tryrdlock, /* ptr_pthread_rwlock_tryrdlock */
|
|
wine_pthread_rwlock_wrlock, /* ptr_pthread_rwlock_wrlock */
|
|
wine_pthread_rwlock_trywrlock, /* ptr_pthread_rwlock_trywrlock */
|
|
wine_pthread_rwlock_unlock, /* ptr_pthread_rwlock_unlock */
|
|
wine_pthread_cond_init, /* ptr_pthread_cond_init */
|
|
wine_pthread_cond_destroy, /* ptr_pthread_cond_destroy */
|
|
wine_pthread_cond_signal, /* ptr_pthread_cond_signal */
|
|
wine_pthread_cond_broadcast, /* ptr_pthread_cond_broadcast */
|
|
wine_pthread_cond_wait, /* ptr_pthread_cond_wait */
|
|
wine_pthread_cond_timedwait /* ptr_pthread_cond_timedwait */
|
|
};
|
|
|
|
static struct wine_pthread_functions pthread_functions;
|
|
|
|
void PTHREAD_Init(void)
|
|
{
|
|
wine_pthread_get_functions( &pthread_functions, sizeof(pthread_functions) );
|
|
pthread_functions.init_process( &callbacks, sizeof(callbacks) );
|
|
}
|
|
|
|
#endif /* HAVE_PTHREAD_H */
|