#include "context_private.h"
#include "xbt/log.h"
#include "xbt/dynar.h"
+#include "xbt/xbt_thread.h"
+/*#include <pthread.h>*/ /* I need pthread_join that is not yet available in xbt_thread.*/
+
+#ifdef CONTEXT_THREADS
+ /* This file (context.c) is only loaded in libsimgrid, not libgras.
+ * xbt_thread is only loaded in libgras explicitly, and we need it in
+ * libsimgrid, but only when it is the backend used to implement the
+ * xbt_context. So, do load it on need.
+ */
+#include "xbt/xbt_thread.c"
+#endif
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_ctx, xbt, "Context");
static xbt_context_t init_context = NULL;
static xbt_swag_t context_to_destroy = NULL;
static xbt_swag_t context_living = NULL;
+static xbt_mutex_t creation_mutex;
+static xbt_thcond_t creation_cond;
-#if (!defined(USE_PTHREADS) && !defined(USE_WIN_THREADS)) /* USE_PTHREADS and USE_CONTEXT are exclusive */
-# ifndef USE_UCONTEXT
-/* don't want to play with conditional compilation in automake tonight, sorry.
- include directly the c file from here when needed. */
-# include "context_win32.c"
-# define USE_WIN_CONTEXT
-# endif
-#endif
-
+static void __context_exit(xbt_context_t context ,int value);
static void __xbt_context_yield(xbt_context_t context)
{
xbt_assert0(current_context,"You have to call context_init() first.");
-
+
DEBUG2("--------- current_context (%p) is yielding to context(%p) ---------",current_context,context);
-
- #ifdef USE_PTHREADS
+
+ #ifdef CONTEXT_THREADS
if (context){
xbt_context_t self = current_context;
- DEBUG0("**** Locking ****");
- pthread_mutex_lock(&(context->mutex));
- DEBUG0("**** Updating current_context ****");
+ DEBUG1("[%p] **** Locking ****", self);
+ xbt_mutex_lock(context->mutex);
+ DEBUG1("[%p] **** Updating current_context ****", self);
current_context = context;
- DEBUG0("**** Releasing the prisonner ****");
- pthread_cond_signal(&(context->cond));
- DEBUG0("**** Going to jail ****");
- pthread_cond_wait(&(context->cond), &(context->mutex));
- DEBUG0("**** Unlocking ****");
- pthread_mutex_unlock(&(context->mutex));
- DEBUG0("**** Updating current_context ****");
+ DEBUG1("[%p] **** Releasing the prisonner ****", self);
+ xbt_thcond_signal(context->cond);
+ DEBUG1("[%p] **** Going to jail ****", self);
+ xbt_thcond_wait(context->cond, context->mutex);
+ DEBUG1("[%p] **** Unlocking ****", self);
+ xbt_mutex_unlock(context->mutex);
+ DEBUG1("[%p] **** Updating current_context ****", self);
current_context = self;
}
- #elif defined(USE_WIN_THREADS)
- if (context){
- xbt_context_t self = current_context;
- DEBUG0("**** Locking ****");
- win_thread_mutex_lock(&(context->mutex));
- DEBUG0("**** Updating current_context ****");
- current_context = context;
- DEBUG0("**** Releasing the prisonner ****");
- win_thread_cond_signal(&(context->cond));
- DEBUG0("**** Going to jail ****");
- win_thread_cond_wait(&(context->cond), &(context->mutex));
- DEBUG0("**** Unlocking ****");
- win_thread_mutex_unlock(&(context->mutex));
- DEBUG0("**** Updating current_context ****");
- current_context = self;
-
- }
- #else
+ #else /* use SUSv2 contexts */
if(current_context)
VOIRP(current_context->save);
if(context->save==NULL){
- DEBUG0("**** Yielding to somebody else ****");
+ DEBUG1("[%p] **** Yielding to somebody else ****", current_context);
DEBUG2("Saving current_context value (%p) to context(%p)->save",current_context,context);
context->save = current_context ;
DEBUG1("current_context becomes context(%p) ",context);
DEBUG1("I am (%p). Coming back\n",context);
} else {
xbt_context_t old_context = context->save ;
- DEBUG0("**** Back ! ****");
+ DEBUG1("[%p] **** Back ! ****", context);
DEBUG2("Setting current_context (%p) to context(%p)->save",current_context,context);
current_context = context->save ;
DEBUG1("Setting context(%p)->save to NULL",context);
}
}
#endif
+ if(current_context->iwannadie)
+ __context_exit(current_context, 1);
+
return;
}
-static void xbt_context_destroy(xbt_context_t context)
+static void xbt_context_free(xbt_context_t context)
{
- #ifdef USE_PTHREADS
+ if (!context) return;
+ DEBUG1("Freeing %p",context);
+#ifdef CONTEXT_THREADS
+ /*DEBUG1("\t joining %p",(void *)context->thread->t);*/
+ DEBUG1("\t joining %p",(void *)context->thread);
+ /*pthread_join(context->thread->t,NULL);*/
+ xbt_thread_join(context->thread,NULL);
+ DEBUG1("\t xbt_free %p",(void *)context->thread);
xbt_free(context->thread);
- pthread_mutex_destroy(&(context->mutex));
- pthread_cond_destroy(&(context->cond));
- #elif defined(USE_WIN_THREADS)
- /*xbt_free(context->thread);*/
-
- if(context->mutex)
- win_thread_mutex_destroy(&(context->mutex));
-
-
- if(context->cond)
- win_thread_cond_destroy(&(context->cond));
-
-
- #endif
+ DEBUG1("\t mutex_destroy %p",(void *)context->mutex);
+ xbt_mutex_destroy(context->mutex);
+ DEBUG1("\t cond_destroy %p",(void *)context->cond);
+ xbt_thcond_destroy(context->cond);
+
+ context->thread = NULL;
+ context->mutex = NULL;
+ context->cond = NULL;
+#endif
if(context->exception)
free(context->exception);
-
- #ifdef USE_WIN_CONTEXT
- if(context->uc.uc_stack.ss_sp)
- free (context->uc.uc_stack.ss_sp);
- #endif
-
+
free(context);
return;
}
static void __context_exit(xbt_context_t context ,int value)
{
int i;
+
+ DEBUG1("--------- %p is exiting ---------",context);
+
+ DEBUG0("Calling cleanup functions");
+ if(context->cleanup_func){
+ DEBUG0("Calling cleanup function");
+ context->cleanup_func(context->cleanup_arg);
+ }
+
DEBUG0("Freeing arguments");
for(i=0;i<context->argc; i++)
if(context->argv[i])
if(context->argv)
free(context->argv);
-
- if(context->cleanup_func){
- DEBUG0("Calling cleanup function");
- context->cleanup_func(context->cleanup_arg);
- }
-
+
DEBUG0("Putting context in the to_destroy set");
xbt_swag_remove(context, context_living);
xbt_swag_insert(context, context_to_destroy);
DEBUG0("Context put in the to_destroy set");
+
DEBUG0("Yielding");
- #ifdef USE_PTHREADS
- DEBUG0("**** Locking ****");
- pthread_mutex_lock(&(context->mutex));
- DEBUG0("**** Updating current_context ****");
- current_context = context;
- DEBUG0("**** Releasing the prisonner ****");
- pthread_cond_signal(&(context->cond));
- DEBUG0("**** Unlocking ****");
- pthread_mutex_unlock(&(context->mutex));
- DEBUG0("**** Exiting ****");
- pthread_exit(0);
- #elif defined(USE_WIN_THREADS)
- DEBUG0("**** Locking ****");
- win_thread_mutex_lock(&(context->mutex));
- DEBUG0("**** Updating current_context ****");
- current_context = context;
- DEBUG0("**** Releasing the prisonner ****");
- win_thread_cond_signal(&(context->cond));
- DEBUG0("**** Unlocking ****");
- win_thread_mutex_unlock(&(context->mutex));
- DEBUG0("**** Exiting ****");
- win_thread_exit(context->thread,0);
+ #ifdef CONTEXT_THREADS
+ DEBUG1("[%p] **** Locking ****", context);
+ xbt_mutex_lock(context->mutex);
+/* DEBUG1("[%p] **** Updating current_context ****"); */
+/* current_context = context; */
+ DEBUG1("[%p] **** Releasing the prisonner ****", context);
+ xbt_thcond_signal(context->cond);
+ DEBUG1("[%p] **** Unlocking ****", context);
+ xbt_mutex_unlock(context->mutex);
+ DEBUG1("[%p] **** Exiting ****", context);
+ xbt_thread_exit(NULL); // We should provide return value in case other wants it
#else
__xbt_context_yield(context);
#endif
xbt_assert0(0,"You can't be here!");
}
-#ifdef USE_WIN_THREADS
-static DWORD WINAPI /* special thread proc signature */
-#else
static void *
-#endif
-__context_wrapper(void* c)
-{
+__context_wrapper(void* c) {
xbt_context_t context = (xbt_context_t)c;
- #ifdef USE_PTHREADS
- DEBUG2("**[%p:%p]** Lock ****",context,(void*)pthread_self());
- pthread_mutex_lock(&(context->mutex));
+ #ifdef CONTEXT_THREADS
+ context->thread = xbt_thread_self();
+
+ DEBUG2("**[%p:%p]** Lock ****",context,(void*)xbt_thread_self());
+ xbt_mutex_lock(creation_mutex);
- DEBUG2("**[%p:%p]** Releasing the prisonner ****",context,(void*)pthread_self());
- pthread_cond_signal(&(context->cond));
+ DEBUG2("**[%p:%p]** Releasing the creator ****",context,(void*)xbt_thread_self());
+ xbt_thcond_signal(creation_cond);
+ xbt_mutex_unlock(creation_mutex);
- DEBUG2("**[%p:%p]** Going to Jail ****",context,(void*)pthread_self());
- pthread_cond_wait(&(context->cond), &(context->mutex));
+ DEBUG2("**[%p:%p]** Going to Jail ****",context,(void*)xbt_thread_self());
+ xbt_mutex_lock(context->mutex);
+ xbt_thcond_wait(context->cond, context->mutex);
- DEBUG2("**[%p:%p]** Unlocking ****",context,(void*)pthread_self());
- pthread_mutex_unlock(&(context->mutex));
+ DEBUG2("**[%p:%p]** Unlocking ****",context,(void*)xbt_thread_self());
+ xbt_mutex_unlock(context->mutex);
- #elif defined(USE_WIN_THREADS)
- DEBUG2("**[%p:%p]** Lock ****",context,(void*)win_thread_self());
- win_thread_mutex_lock(&(context->mutex));
-
- DEBUG2("**[%p:%p]** Releasing the prisonner ****",context,(void*)win_thread_self());
- win_thread_cond_signal(&(context->cond));
-
- DEBUG2("**[%p:%p]** Going to Jail ****",context,(void*)win_thread_self());
- win_thread_cond_wait(&(context->cond), &(context->mutex));
-
- DEBUG2("**[%p:%p]** Unlocking ****",context,(void*)win_thread_self());
- win_thread_mutex_unlock(&(context->mutex));
-
#endif
if(context->startup_func)
{
if(!current_context){
current_context = init_context = xbt_new0(s_xbt_context_t,1);
-
- /*#ifdef USE_WIN_THREADS
- win_thread_mutex_init(&(current_context->mutex));
- win_thread_cond_init(&(current_context->cond));
- #endif*/
-
+ DEBUG1("Init Context (%p)",init_context);
+
init_context->exception = xbt_new(ex_ctx_t,1);
XBT_CTX_INITIALIZE(init_context->exception);
__xbt_ex_ctx = __context_ex_ctx;
context_to_destroy = xbt_swag_new(xbt_swag_offset(*current_context,hookup));
context_living = xbt_swag_new(xbt_swag_offset(*current_context,hookup));
xbt_swag_insert(init_context, context_living);
+#ifdef CONTEXT_THREADS
+ creation_mutex = xbt_mutex_init();
+ creation_cond = xbt_thcond_init();
+#endif
}
}
void xbt_context_empty_trash(void)
{
xbt_context_t context=NULL;
-
+ DEBUG1("Emptying trashbin (%d contexts to free)",
+ xbt_swag_size(context_to_destroy));
while((context=xbt_swag_extract(context_to_destroy)))
- xbt_context_destroy(context);
+ xbt_context_free(context);
}
/**
*/
void xbt_context_start(xbt_context_t context)
{
- #ifdef USE_PTHREADS
+ #ifdef CONTEXT_THREADS
/* Launch the thread */
DEBUG1("**[%p]** Locking ****",context);
- pthread_mutex_lock(&(context->mutex));
- DEBUG1("**[%p]** Pthread create ****",context);
- xbt_assert0(!pthread_create(context->thread, NULL, __context_wrapper, context),"Unable to create a thread.");
- DEBUG2("**[%p]** Pthread created : %p ****",context,(void*)(*(context->thread)));
+ xbt_mutex_lock(creation_mutex);
+
+ DEBUG1("**[%p]** Thread create ****",context);
+ context->thread = xbt_thread_create(__context_wrapper, context);
+ DEBUG2("**[%p]** Thread created : %p ****",context,context->thread);
+
DEBUG1("**[%p]** Going to jail ****",context);
- pthread_cond_wait(&(context->cond), &(context->mutex));
+ xbt_thcond_wait(creation_cond, creation_mutex);
DEBUG1("**[%p]** Unlocking ****",context);
- pthread_mutex_unlock(&(context->mutex));
- #elif defined(USE_WIN_THREADS)
- /* Launch the thread */
- DEBUG1("**[%p]** Locking ****",context);
- win_thread_mutex_lock(&(context->mutex));
- DEBUG1("**[%p]** Windows thread create ****",context);
- xbt_assert0(!win_thread_create(&(context->thread), __context_wrapper, context),"Unable to create a thread.");
- DEBUG2("**[%p]** Windows created : %p ****",context,(void*)(context->thread));
- DEBUG1("**[%p]** Going to jail ****",context);
- win_thread_cond_wait(&(context->cond), &(context->mutex));
- DEBUG1("**[%p]** Unlocking ****",context);
- win_thread_mutex_unlock(&(context->mutex));
+ xbt_mutex_unlock(creation_mutex);
#else
makecontext (&(context->uc), (void (*) (void)) __context_wrapper,1, context);
#endif
res = xbt_new0(s_xbt_context_t,1);
res->code = code;
- #ifdef USE_PTHREADS
- res->thread = xbt_new0(pthread_t,1);
- xbt_assert0(!pthread_mutex_init(&(res->mutex), NULL), "Mutex initialization error");
- xbt_assert0(!pthread_cond_init(&(res->cond), NULL), "Condition initialization error");
- #elif defined(USE_WIN_THREADS)
- /*res->thread = xbt_new0(pthread_t,1);*/
- xbt_assert0(!win_thread_mutex_init(&(res->mutex)), "Mutex initialization error");
- xbt_assert0(!win_thread_cond_init(&(res->cond)), "Condition initialization error");
+ #ifdef CONTEXT_THREADS
+ res->mutex = xbt_mutex_init();
+ res->cond = xbt_thcond_init();
#else
- /* FIXME: strerror is not thread safe */
+
xbt_assert2(getcontext(&(res->uc))==0,"Error in context saving: %d (%s)", errno, strerror(errno));
res->uc.uc_link = NULL;
/* res->uc.uc_link = &(current_context->uc); */
/* WARNING : when this context is over, the current_context (i.e. the
father), is awaken... Theorically, the wrapper should prevent using
this feature. */
- # ifdef USE_WIN_CONTEXT
- res->uc.uc_stack.ss_sp = xbt_malloc(STACK_SIZE);
- res->uc.uc_stack.ss_size = STACK_SIZE ;
- #else
res->uc.uc_stack.ss_sp = pth_skaddr_makecontext(res->stack,STACK_SIZE);
res->uc.uc_stack.ss_size = pth_sksize_makecontext(res->stack,STACK_SIZE);
- # endif /* USE_WIN_CONTEXT */
- #endif /* USE_PTHREADS or not */
+ #endif /* CONTEXT_THREADS or not */
res->argc = argc;
res->argv = argv;
*/
void xbt_context_exit(void) {
xbt_context_t context=NULL;
-
- /*#ifdef USE_WIN_THREADS
- win_thread_mutex_destroy(&(current_context->mutex));
- win_thread_cond_destroy(&(current_context->cond));
- #endif*/
+
+ xbt_context_empty_trash();
+ while((context=xbt_swag_extract(context_living))) {
+ if(context!=init_context) {
+ xbt_context_kill(context);
+ }
+ }
+ // xbt_context_kill(init_context);
xbt_context_empty_trash();
xbt_swag_free(context_to_destroy);
-
- while((context=xbt_swag_extract(context_living)))
- xbt_context_free(context);
-
xbt_swag_free(context_living);
init_context = current_context = NULL ;
+#ifdef CONTEXT_THREADS
+ xbt_mutex_destroy(creation_mutex);
+ xbt_thcond_destroy(creation_cond);
+#endif
}
/**
*
* This function simply kills \a context... scarry isn't it ?
*/
-void xbt_context_free(xbt_context_t context)
+void xbt_context_kill(xbt_context_t context)
{
- int i ;
-
- xbt_swag_remove(context, context_living);
-
- for(i=0;i<context->argc; i++)
- if(context->argv[i])
- free(context->argv[i]);
-
- if(context->argv)
- free(context->argv);
-
- if(context->cleanup_func)
- context->cleanup_func(context->cleanup_arg);
-
- xbt_context_destroy(context);
+ DEBUG1("Killing %p", context);
+
+ context->iwannadie=1;
+ DEBUG1("Scheduling %p",context);
+ __xbt_context_yield(context);
+ DEBUG1("End of Scheduling %p",context);
return;
}
