Re: interprocess communication

• Subject: Re: interprocess communication
• From: Jonas Maebe <email@hidden>
• Date: Mon, 24 Nov 2008 10:59:02 +0100
• Delivered-to: email@hidden
• Delivered-to: email@hidden

On 24 Nov 2008, at 04:28, Rakesh Singhal wrote:

pthread_cond_signal() leaves the object nonsignaled like PulseEvent()
in Win32. Is there any POSIX or Mac function which leaves the object
signaled like SetEvent() in Win32? Counting semaphore will not fit in
my case.

typedef struct _persistent_event
{
  pthread_cond_t cond;
  pthread_mutex_t mutex;
  int isset;
} t_persistent_event;

t_persistent_event *NewEvent(void)
{
  t_persistent_event *event = malloc(sizeof(*event));
  pthread_cond_init(&event->condvar, NULL);
  pthread_mutex_init(&event->mutex, NULL);
  event->isset=0;
  return event;
}

void SetEvent(t_persistent_event *event)
{
  pthread_mutex_lock(&event->mutex);
  event->isset=1;
  pthread_cond_signal(&event->cond);
  pthread_mutex_unlock(&event->mutex);
}

void WaitEvent(t_persistent_event *event)
{
  pthread_mutex_lock(&event->mutex);
  while (!event->isset)
    pthread_cond_wait(&event->condvar,&event->mutex);
  event->isset=0;
  pthread_mutex_unlock(&event->mutex);
}

ResetEvent() and DestroyEvent() left as an exercise to the reader.

Jonas
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