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omp_test_nest_lock

Essaie de définir un verrou empilable mais ne bloque pas l'exécution des threads.

int omp_test_nest_lock(
   omp_nest_lock_t *lock
);

Notes

où,

Notes

Pour plus d'informations, consultez 3.2.5 fonctions d'omp_test_lock et d'omp_test_nest_lock.

Exemple

// omp_test_nest_lock.cpp
// compile with: /openmp
#include <stdio.h>
#include <omp.h>

omp_nest_lock_t nestable_lock;    

int main() {
   omp_init_nest_lock(&nestable_lock);

   #pragma omp parallel num_threads(4)
   {
      int tid = omp_get_thread_num();
      while (!omp_test_nest_lock(&nestable_lock))
         printf_s("Thread %d - failed to acquire nestable_lock\n",
                tid);

      printf_s("Thread %d - acquired nestable_lock\n", tid);

      if (omp_test_nest_lock(&nestable_lock)) {
         printf_s("Thread %d - acquired nestable_lock again\n",
                tid);
         printf_s("Thread %d - released nestable_lock\n", 
                tid);
         omp_unset_nest_lock(&nestable_lock);
      }

      printf_s("Thread %d - released nestable_lock\n", tid);
      omp_unset_nest_lock(&nestable_lock);
   }

   omp_destroy_nest_lock(&nestable_lock);
}
  

Voir aussi

Concepts

Fonctions d'OpenMP