mirror of git://gcc.gnu.org/git/gcc.git
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/******************************************************************************
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* FILE: omp_hello.c
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* DESCRIPTION:
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* OpenMP Example - Hello World - C/C++ Version
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* In this simple example, the master thread forks a parallel region.
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* All threads in the team obtain their unique thread number and print it.
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* The master thread only prints the total number of threads. Two OpenMP
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* library routines are used to obtain the number of threads and each
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* thread's number.
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* AUTHOR: Blaise Barney 5/99
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* LAST REVISED: 04/06/05
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******************************************************************************/
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#include <omp.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main (int argc, char *argv[]) {
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int nthreads, tid;
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/* Fork a team of threads giving them their own copies of variables */
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#pragma omp parallel private(nthreads, tid)
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{
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/* Obtain thread number */
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tid = omp_get_thread_num();
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printf("Hello World from thread = %d\n", tid);
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/* Only master thread does this */
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if (tid == 0)
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{
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nthreads = omp_get_num_threads();
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printf("Number of threads = %d\n", nthreads);
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}
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} /* All threads join master thread and disband */
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return 0;
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}
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