omp_test_lock
Attempts to set a lock but does not block thread execution.
int omp_test_lock(
omp_lock_t *lock
);
Remarks
where,
- lock
A variable of type omp_lock_t that was initialized with omp_init_lock.
Remarks
For more information, see 3.2.5 omp_test_lock and omp_test_nest_lock Functions.
Example
// omp_test_lock.cpp
// compile with: /openmp
#include <stdio.h>
#include <omp.h>
omp_lock_t simple_lock;
int main() {
omp_init_lock(&simple_lock);
#pragma omp parallel num_threads(4)
{
int tid = omp_get_thread_num();
while (!omp_test_lock(&simple_lock))
printf_s("Thread %d - failed to acquire simple_lock\n",
tid);
printf_s("Thread %d - acquired simple_lock\n", tid);
printf_s("Thread %d - released simple_lock\n", tid);
omp_unset_lock(&simple_lock);
}
omp_destroy_lock(&simple_lock);
}
Thread 1 - acquired simple_lock Thread 1 - released simple_lock Thread 0 - failed to acquire simple_lock Thread 3 - failed to acquire simple_lock Thread 0 - failed to acquire simple_lock Thread 3 - failed to acquire simple_lock Thread 2 - acquired simple_lock Thread 0 - failed to acquire simple_lock Thread 3 - failed to acquire simple_lock Thread 0 - failed to acquire simple_lock Thread 3 - failed to acquire simple_lock Thread 2 - released simple_lock Thread 0 - failed to acquire simple_lock Thread 3 - failed to acquire simple_lock Thread 0 - acquired simple_lock Thread 3 - failed to acquire simple_lock Thread 0 - released simple_lock Thread 3 - failed to acquire simple_lock Thread 3 - acquired simple_lock Thread 3 - released simple_lock