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/**
* @brief C11 Threads Example
*/
/*
* This file's license is 2-clause BSD as in this distribution's
* LICENSE.2 file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <threads.h>
#include <assert.h>
static thrd_t thread1;
static thrd_t thread2;
void initialize_subsystem_once(void)
{
printf("*** Subsystem initialization should only happen once\n");
}
void initialize_subsystem(void)
{
static once_flag initialize_subsystem_only_once= ONCE_FLAG_INIT;
call_once(&initialize_subsystem_only_once, initialize_subsystem_once);
}
int Thread1_Body(void *arg)
{
thrd_t *t = (thrd_t *) arg;
int rc;
int result;
initialize_subsystem();
printf("Thread1(0x%08lx)\n", *t);
assert(thrd_current() == thread1);
puts("Thread1 - yield" );
thrd_yield();
puts("Thread1 - join Thread2" );
rc = thrd_join(thread2, &result);
assert(rc == thrd_success);
printf("Thread1 - thread1 exited with %d\n", result);
puts("Thread1 - exit" );
thrd_exit(0);
return 0;
}
int Thread2_Body(void *arg)
{
thrd_t *t = (thrd_t *) arg;
initialize_subsystem();
printf("Thread2(0x%08lx)\n", *t);
assert(thrd_current() == thread2);
puts("Thread2 - exit" );
thrd_exit(128);
return 0;
}
int main(int argc, char **argv)
{
int rc;
struct timespec delay = {1, 0};
puts("*** START OF C11 THREAD EXAMPLE ***");
initialize_subsystem();
puts("main - Create Thread1");
rc = thrd_create(&thread1, Thread1_Body, &thread1);
assert(rc == thrd_success);
puts("main - Detach Thread1");
rc = thrd_detach(thread1);
assert(rc == thrd_success);
puts("main - yield to Thread1" );
thrd_yield();
puts("main - Create Thread2");
rc = thrd_create(&thread2, Thread2_Body, &thread2);
assert(rc == thrd_success);
puts("Exercise thrd_equal");
rc = thrd_equal(thread1, thread2);
assert(rc == 0);
rc = thrd_equal(thread1, thread1);
assert(rc != 0);
puts("main - sleep and let Thread2 run");
rc = thrd_sleep(&delay, NULL);
assert(rc == 0);
puts("*** END OF C11 THREAD EXAMPLE ***");
return 0;
}
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