+++ /dev/null
-/* $Id$ */
-
-/* xbt_thread -- portability layer over the pthread API */
-
-/* Copyright 2006,2007 Malek Cherier, Martin Quinson
- * All right reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#include "xbt/sysdep.h"
-#include "xbt/ex.h"
-#include "portable.h"
-#include "xbt/xbt_thread.h" /* This module */
-#include "xbt_modinter.h" /* Initialization/finalization of this module */
-
-
-
-/* ********************************* PTHREAD IMPLEMENTATION ************************************ */
-#ifdef HAVE_PTHREAD_H
-#include <pthread.h>
-
-typedef struct xbt_thread_ {
- pthread_t t;
- void *param;
- pvoid_f_pvoid_t *start_routine;
-} s_xbt_thread_t ;
-
-/* thread-specific data containing the xbt_thread_t structure */
-static pthread_key_t xbt_self_thread_key;
-
-/* frees the xbt_thread_t corresponding to the current thread */
-static void xbt_thread_free_thread_data(void*d){
- free(d);
-}
-
-void xbt_thread_mod_init(void) {
- int errcode;
-
- if ((errcode=pthread_key_create(&xbt_self_thread_key, NULL)))
- THROW0(system_error,errcode,"pthread_key_create failed for xbt_self_thread_key");
-}
-void xbt_thread_mod_exit(void) {
- /* FIXME: don't try to free our key on shutdown. Valgrind detects no leak if we don't, and whine if we try to */
-// int errcode;
-
-// if ((errcode=pthread_key_delete(xbt_self_thread_key)))
-// THROW0(system_error,errcode,"pthread_key_delete failed for xbt_self_thread_key");
-}
-
-static void * wrapper_start_routine(void *s) {
- xbt_thread_t t = s;
- int errcode;
-
- if ((errcode=pthread_setspecific(xbt_self_thread_key,t)))
- THROW0(system_error,errcode,"pthread_setspecific failed for xbt_self_thread_key");
- return t->start_routine(t->param);
-}
-
-xbt_thread_t xbt_thread_create(pvoid_f_pvoid_t start_routine,
- void* param) {
- int errcode;
-
- xbt_thread_t res_thread=xbt_new(s_xbt_thread_t,1);
- res_thread->start_routine = start_routine;
- res_thread->param = param;
-
-
- if ((errcode = pthread_create(&(res_thread->t), NULL, wrapper_start_routine, res_thread)))
- THROW1(system_error,errcode, "pthread_create failed: %s",strerror(errcode));
-
- return res_thread;
-}
-
-void
-xbt_thread_join(xbt_thread_t thread,void ** thread_return) {
-
- int errcode;
-
- if ((errcode = pthread_join(thread->t,thread_return)))
- THROW1(system_error,errcode, "pthread_join failed: %s",
- strerror(errcode));
- free(thread);
-}
-
-void xbt_thread_exit(int *retval) {
- pthread_exit(retval);
-}
-
-xbt_thread_t xbt_thread_self(void) {
- return pthread_getspecific(xbt_self_thread_key);
-}
-
-#include <sched.h>
-void xbt_thread_yield(void) {
- sched_yield();
-}
-/****** mutex related functions ******/
-typedef struct xbt_mutex_ {
- pthread_mutex_t m;
-} s_xbt_mutex_t;
-
-xbt_mutex_t xbt_mutex_init(void) {
- xbt_mutex_t res = xbt_new(s_xbt_mutex_t,1);
- int errcode;
-
- if ((errcode = pthread_mutex_init(&(res->m),NULL)))
- THROW1(system_error,errcode,"pthread_mutex_init() failed: %s",
- strerror(errcode));
-
- return res;
-}
-
-void xbt_mutex_lock(xbt_mutex_t mutex) {
- int errcode;
-
- if ((errcode=pthread_mutex_lock(&(mutex->m))))
- THROW2(system_error,errcode,"pthread_mutex_lock(%p) failed: %s",
- mutex, strerror(errcode));
-}
-
-void xbt_mutex_unlock(xbt_mutex_t mutex) {
- int errcode;
-
- if ((errcode=pthread_mutex_unlock(&(mutex->m))))
- THROW2(system_error,errcode,"pthread_mutex_unlock(%p) failed: %s",
- mutex, strerror(errcode));
-}
-
-void xbt_mutex_destroy(xbt_mutex_t mutex) {
- int errcode;
-
- if (!mutex) return;
-
- if ((errcode=pthread_mutex_destroy(&(mutex->m))))
- THROW2(system_error,errcode,"pthread_mutex_destroy(%p) failed: %s",
- mutex, strerror(errcode));
- free(mutex);
-}
-
-/***** condition related functions *****/
-typedef struct xbt_thcond_ {
- pthread_cond_t c;
-} s_xbt_thcond_t;
-
-xbt_thcond_t xbt_thcond_init(void) {
- xbt_thcond_t res = xbt_new(s_xbt_thcond_t,1);
- int errcode;
- if ((errcode=pthread_cond_init(&(res->c),NULL)))
- THROW1(system_error,errcode,"pthread_cond_init() failed: %s",
- strerror(errcode));
-
- return res;
-}
-
-void xbt_thcond_wait(xbt_thcond_t cond, xbt_mutex_t mutex) {
- int errcode;
- if ((errcode=pthread_cond_wait(&(cond->c),&(mutex->m))))
- THROW3(system_error,errcode,"pthread_cond_wait(%p,%p) failed: %s",
- cond,mutex, strerror(errcode));
-}
-
-void xbt_thcond_signal(xbt_thcond_t cond) {
- int errcode;
- if ((errcode=pthread_cond_signal(&(cond->c))))
- THROW2(system_error,errcode,"pthread_cond_signal(%p) failed: %s",
- cond, strerror(errcode));
-}
-
-void xbt_thcond_broadcast(xbt_thcond_t cond){
- int errcode;
- if ((errcode=pthread_cond_broadcast(&(cond->c))))
- THROW2(system_error,errcode,"pthread_cond_broadcast(%p) failed: %s",
- cond, strerror(errcode));
-}
-void xbt_thcond_destroy(xbt_thcond_t cond){
- int errcode;
-
- if (!cond) return;
-
- if ((errcode=pthread_cond_destroy(&(cond->c))))
- THROW2(system_error,errcode,"pthread_cond_destroy(%p) failed: %s",
- cond, strerror(errcode));
- free(cond);
-}
-
-/* ********************************* WINDOWS IMPLEMENTATION ************************************ */
-
-#elif defined(WIN32)
-
-typedef struct xbt_thread_ {
- HANDLE handle; /* the win thread handle */
- unsigned long id; /* the win thread id */
- pvoid_f_pvoid_t *start_routine;
- void* param;
-} s_xbt_thread_t ;
-
-/* key to the TLS containing the xbt_thread_t structure */
-static unsigned long xbt_self_thread_key;
-
-void xbt_thread_mod_init(void) {
- xbt_self_thread_key = TlsAlloc();
-}
-void xbt_thread_mod_exit(void) {
-
- if (!TlsFree(xbt_self_thread_key))
- THROW0(system_error,(int)GetLastError(),"TlsFree() failed to cleanup the thread submodule");
-}
-
-static DWORD WINAPI wrapper_start_routine(void *s) {
- xbt_thread_t t = (xbt_thread_t)s;
-
- if(!TlsSetValue(xbt_self_thread_key,t))
- THROW0(system_error,(int)GetLastError(),"TlsSetValue of data describing the created thread failed");
-
- return (DWORD)t->start_routine(t->param);
-}
-
-
-xbt_thread_t xbt_thread_create(pvoid_f_pvoid_t start_routine,
- void* param) {
-
- xbt_thread_t t = xbt_new(s_xbt_thread_t,1);
-
- t->start_routine = start_routine ;
- t->param = param;
-
- t->handle = CreateThread(NULL,0,
- (LPTHREAD_START_ROUTINE)wrapper_start_routine,
- t,0,&(t->id));
-
- if(!t->handle) {
- xbt_free(t);
- THROW0(system_error,(int)GetLastError(),"CreateThread failed");
- }
-
- return t;
-}
-
-void
-xbt_thread_join(xbt_thread_t thread,void ** thread_return) {
-
- if(WAIT_OBJECT_0 != WaitForSingleObject(thread->handle,INFINITE))
- THROW0(system_error,(int)GetLastError(), "WaitForSingleObject failed");
-
- if(thread_return){
-
- if(!GetExitCodeThread(thread->handle,(DWORD*)(*thread_return)))
- THROW0(system_error,(int)GetLastError(), "GetExitCodeThread failed");
- }
-
- CloseHandle(thread->handle);
- free(thread);
-}
-
-void xbt_thread_exit(int *retval) {
- if(retval)
- ExitThread(*retval);
- else
- ExitThread(0);
-}
-
-xbt_thread_t xbt_thread_self(void) {
- return TlsGetValue(xbt_self_thread_key);
-}
-
-void xbt_thread_yield(void) {
- Sleep(0);
-}
-
-/****** mutex related functions ******/
-typedef struct xbt_mutex_ {
- CRITICAL_SECTION lock;
-} s_xbt_mutex_t;
-
-xbt_mutex_t xbt_mutex_init(void) {
- xbt_mutex_t res = xbt_new(s_xbt_mutex_t,1);
-
- /* initialize the critical section object */
- InitializeCriticalSection(&(res->lock));
-
- return res;
-}
-
-void xbt_mutex_lock(xbt_mutex_t mutex) {
-
- EnterCriticalSection(& mutex->lock);
-}
-
-void xbt_mutex_unlock(xbt_mutex_t mutex) {
-
- LeaveCriticalSection (& mutex->lock);
-
-}
-
-void xbt_mutex_destroy(xbt_mutex_t mutex) {
-
- if (!mutex) return;
-
- DeleteCriticalSection(& mutex->lock);
- free(mutex);
-}
-
-/***** condition related functions *****/
- enum {
- SIGNAL = 0,
- BROADCAST = 1,
- MAX_EVENTS = 2
- };
-
-typedef struct xbt_thcond_ {
- HANDLE events[MAX_EVENTS];
-
- unsigned int waiters_count; /* the number of waiters */
- CRITICAL_SECTION waiters_count_lock; /* protect access to waiters_count */
-} s_xbt_thcond_t;
-
-xbt_thcond_t xbt_thcond_init(void) {
-
- xbt_thcond_t res = xbt_new0(s_xbt_thcond_t,1);
-
- memset(& res->waiters_count_lock,0,sizeof(CRITICAL_SECTION));
-
- /* initialize the critical section object */
- InitializeCriticalSection(& res->waiters_count_lock);
-
- res->waiters_count = 0;
-
- /* Create an auto-reset event */
- res->events[SIGNAL] = CreateEvent (NULL, FALSE, FALSE, NULL);
-
- if(!res->events[SIGNAL]){
- DeleteCriticalSection(& res->waiters_count_lock);
- free(res);
- THROW0(system_error,0,"CreateEvent failed for the signals");
- }
-
- /* Create a manual-reset event. */
- res->events[BROADCAST] = CreateEvent (NULL, TRUE, FALSE,NULL);
-
- if(!res->events[BROADCAST]){
-
- DeleteCriticalSection(& res->waiters_count_lock);
- CloseHandle(res->events[SIGNAL]);
- free(res);
- THROW0(system_error,0,"CreateEvent failed for the broadcasts");
- }
-
- return res;
-}
-
-void xbt_thcond_wait(xbt_thcond_t cond, xbt_mutex_t mutex) {
-
- unsigned long wait_result;
- int is_last_waiter;
-
- /* lock the threads counter and increment it */
- EnterCriticalSection (& cond->waiters_count_lock);
- cond->waiters_count++;
- LeaveCriticalSection (& cond->waiters_count_lock);
-
- /* unlock the mutex associate with the condition */
- LeaveCriticalSection (& mutex->lock);
-
- /* wait for a signal (broadcast or no) */
- wait_result = WaitForMultipleObjects (2, cond->events, FALSE, INFINITE);
-
- if(wait_result == WAIT_FAILED)
- THROW0(system_error,0,"WaitForMultipleObjects failed, so we cannot wait on the condition");
-
- /* we have a signal lock the condition */
- EnterCriticalSection (& cond->waiters_count_lock);
- cond->waiters_count--;
-
- /* it's the last waiter or it's a broadcast ? */
- is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1) && (cond->waiters_count == 0));
-
- LeaveCriticalSection (& cond->waiters_count_lock);
-
- /* yes it's the last waiter or it's a broadcast
- * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
- * by the system.
- */
- if (is_last_waiter)
- if(!ResetEvent (cond->events[BROADCAST]))
- THROW0(system_error,0,"ResetEvent failed");
-
- /* relock the mutex associated with the condition in accordance with the posix thread specification */
- EnterCriticalSection (& mutex->lock);
-}
-
-void xbt_thcond_signal(xbt_thcond_t cond) {
- int have_waiters;
-
- EnterCriticalSection (& cond->waiters_count_lock);
- have_waiters = cond->waiters_count > 0;
- LeaveCriticalSection (& cond->waiters_count_lock);
-
- if (have_waiters)
- if(!SetEvent(cond->events[SIGNAL]))
- THROW0(system_error,0,"SetEvent failed");
-
- xbt_thread_yield();
-}
-
-void xbt_thcond_broadcast(xbt_thcond_t cond){
- int have_waiters;
-
- EnterCriticalSection (& cond->waiters_count_lock);
- have_waiters = cond->waiters_count > 0;
- LeaveCriticalSection (& cond->waiters_count_lock);
-
- if (have_waiters)
- SetEvent(cond->events[BROADCAST]);
-}
-
-void xbt_thcond_destroy(xbt_thcond_t cond){
- int error = 0;
-
- if (!cond) return;
-
- if(!CloseHandle(cond->events[SIGNAL]))
- error = 1;
-
- if(!CloseHandle(cond->events[BROADCAST]))
- error = 1;
-
- DeleteCriticalSection(& cond->waiters_count_lock);
-
- xbt_free(cond);
-
- if (error)
- THROW0(system_error,0,"Error while destroying the condition");
-}
-
-#endif
