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[mirrors/Programs.git] / c / pthread_extra / pthread_pause.c

diff --git a/c/pthread_extra/pthread_pause.c b/c/pthread_extra/pthread_pause.c
index c6b96f6d8a0518907c477971c7f63da366cabaa7..4107b38004fac9c2cb1686b91ff546d157ca7518 100644 (file)
--- a/c/pthread_extra/pthread_pause.c
+++ b/c/pthread_extra/pthread_pause.c
@@ -12,10 +12,14 @@
 #include <assert.h>
 //#include <sys/time.h>
 
+///When this variable is nonzero, only referenced thread is allowed to run
+///Access has to be protected by pthread_user_data_lock()
+pthread_t pthread_pause_holder = 0;
+
 void pthread_pause_handler(const int signal, siginfo_t *info, void *ptr) {
        (void)signal; (void)info; (void)ptr;
-       pthread_user_data_internal_t *td = (pthread_user_data_internal_t *)(info->si_value.sival_ptr);
-       (void)td;
+       int run = info->si_value.sival_int;
+       //(void)td;
 
        //Do nothing when there are more signals pending (to cleanup the queue)
        sigset_t pending;
@@ -30,7 +34,7 @@ void pthread_pause_handler(const int signal, siginfo_t *info, void *ptr) {
        //printf("RCV: %p = %p\n", (void *)pthread_user_data_internal(pthread_self()), (void *)td);
 
        //if(!pthread_user_data_internal(pthread_self())->running) {
-       if(!td->running) {
+       if(!run) {
                sigsuspend(&sigset);
        }
 }
@@ -75,6 +79,7 @@ void pthread_pause_disable() {
        pthread_sigmask(SIG_BLOCK, &sigset, NULL);
 }
 
+/*
 int pthread_pause_reschedule(pthread_t thread) {
        //Send signal to initiate pause handler
        //printf("SND: %p\n", (void *)pthread_user_data_internal(thread));
@@ -84,6 +89,27 @@ int pthread_pause_reschedule(pthread_t thread) {
                ) == EAGAIN) usleep(1000);
        return 0;
 }
+*/
+
+int pthread_pause_reschedule(pthread_t thread) {
+       //Decide if the thread should run
+
+       pthread_user_data_lock();
+       //Check if thread has running flag
+       int run = (pthread_user_data_internal(thread)->running);
+       //Check if privileged (single thread) mode is active
+       if((pthread_pause_holder != 0) && !pthread_equal(pthread_pause_holder, thread)) {
+               run = 0;
+       }
+       pthread_user_data_unlock();
+
+       //Send signal to initiate pause handler (keep trying while SigQueue is full)
+       //while(pthread_kill(thread, PTHREAD_XSIG_STOP) == EAGAIN) usleep(1000);
+       while(pthread_sigqueue(thread, PTHREAD_XSIG_STOP,
+               (const union sigval){.sival_int=run}
+               ) == EAGAIN) usleep(1000);
+       return 0;
+}
 
 int pthread_extra_yield() {
        //Yield to both schedulers
@@ -93,18 +119,39 @@ int pthread_extra_yield() {
 
 int pthread_pause(pthread_t thread) {
        //Set thread as paused and notify it via signal (wait when queue full)
+       pthread_user_data_lock();
        pthread_user_data_internal(thread)->running = 0;
+       pthread_user_data_unlock();
        pthread_pause_reschedule(thread);
        return 0;
 }
 
 int pthread_unpause(pthread_t thread) {
        //Set thread as running and notify it via signal (wait when queue full)
+       pthread_user_data_lock();
        pthread_user_data_internal(thread)->running = 1;
+       pthread_user_data_unlock();
        pthread_pause_reschedule(thread);
        return 0;
 }
 
+int pthread_pause_all() {
+       pthread_user_data_lock();
+       if(pthread_pause_holder!=0) assert(pthread_equal(pthread_pause_holder, pthread_self()));
+       pthread_pause_holder = pthread_self();
+       pthread_user_data_unlock();
+       //todo reschedule all
+       return 0;
+}
+
+int pthread_unpause_all() {
+       pthread_user_data_lock();
+       if(pthread_pause_holder!=0) assert(pthread_equal(pthread_pause_holder, pthread_self()));
+       pthread_pause_holder = 0;
+       pthread_user_data_unlock();
+       //todo reschedule
+       return 0;
+}
 
 
 // Wrappers ///////////////////////////////////////////////////////////
@@ -126,8 +173,10 @@ void *pthread_extra_thread_wrapper(void *arg) {
        pthread_cleanup_push(pthread_user_data_cleanup, (void *)pthread_self());
 
        //Check if we should be running according to pthread_pause sub-scheduler
-       pthread_pause_reschedule(pthread_self());
+       //pthread_pause_reschedule(pthread_self());
+       pthread_extra_yield();
 
+       //Run actual task
        return task.start_routine(task.arg);
 
        pthread_cleanup_pop(1); //Needed by pthread_cleanup_push() macro