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#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <errno.h>
#include <unistd.h>
#include <ctime>
#include <cstring>
#include <cassert>
struct worker_t
{
const char* name;
int count;
pthread_t thread;
pthread_mutex_t lock;
pthread_cond_t cond;
long int wait_time;
};
void* run_worker(void* args)
{
struct timespec time_to_wait = {0, 0};
worker_t* worker = (worker_t*)args;
worker->count = 0;
while (worker->count < 25) {
time_to_wait.tv_sec = time(nullptr) + worker->wait_time;
pthread_mutex_lock(&worker->lock);
int rc = pthread_cond_timedwait(&worker->cond, &worker->lock, &time_to_wait);
// Validate return code is always timed out.
assert(rc == -1);
assert(errno == ETIMEDOUT);
worker->count++;
printf("Increase worker[%s] count to [%d]\n", worker->name, worker->count);
pthread_mutex_unlock(&worker->lock);
}
return nullptr;
}
void init_worker(worker_t* worker, const char* name, long int wait_time)
{
worker->name = name;
worker->wait_time = wait_time;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
pthread_mutex_init(&worker->lock, nullptr);
pthread_cond_init(&worker->cond, nullptr);
pthread_create(&worker->thread, &attr, &run_worker, (void*) worker);
pthread_attr_destroy(&attr);
}
int main()
{
worker_t worker_a;
init_worker(&worker_a, "A", 2L);
worker_t worker_b;
init_worker(&worker_b, "B", 4L);
pthread_join(worker_a.thread, nullptr);
pthread_join(worker_b.thread, nullptr);
return EXIT_SUCCESS;
}
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