#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <pthread.h>
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void *thread_worker1(void *args);
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void *thread_worker2(void *args);
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typedef struct worker_ctx_s
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{
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int shared_var;
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pthread_mutex_t lock;
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} worker_ctx_t;
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int main(int argc, char **argv)
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{
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worker_ctx_t worker_ctx;
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pthread_t tid;
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pthread_attr_t thread_attr;
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worker_ctx.shared_var = 1000;
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pthread_mutex_init(&worker_ctx.lock, NULL);
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if( pthread_attr_init(&thread_attr) )
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{
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printf("pthread_attr_init() failure: %s\n", strerror(errno));
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return -1;
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}
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if( pthread_attr_setstacksize(&thread_attr, 120*1024) )
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{
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printf("pthread_attr_setstacksize() failure: %s\n", strerror(errno));
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return -1;
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}
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if( pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED) )
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{
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printf("pthread_attr_setdetachstate() failure: %s\n", strerror(errno));
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return -1;
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}
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pthread_create(&tid, &thread_attr, thread_worker1, &worker_ctx);
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printf("Thread worker1 tid[%ld] created ok\n", tid);
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pthread_create(&tid, &thread_attr, thread_worker2, &worker_ctx);
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printf("Thread worker2 tid[%ld] created ok\n", tid);
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while(1)
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{
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printf("Main/Control thread shared_var: %d\n", worker_ctx.shared_var);
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sleep(10);
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}
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pthread_mutex_destroy(&worker_ctx.lock);
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}
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void *thread_worker1(void *args)
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{
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worker_ctx_t *ctx = (worker_ctx_t *)args;
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if( !args )
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{
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printf("%s() get invalid arguments\n", __FUNCTION__);
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pthread_exit(NULL);
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}
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printf("Thread workder 1 [%ld] start running...\n", pthread_self());
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while(1)
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{
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pthread_mutex_lock(&ctx->lock);
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printf("+++: %s before shared_var++: %d\n", __FUNCTION__, ctx->shared_var);
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ctx->shared_var ++;
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sleep(2);
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printf("+++: %s after sleep shared_var: %d\n", __FUNCTION__, ctx->shared_var);
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pthread_mutex_unlock(&ctx->lock);
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sleep(1);
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}
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printf("Thread workder 1 exit...\n");
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return NULL;
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}
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void *thread_worker2(void *args)
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{
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worker_ctx_t *ctx = (worker_ctx_t *)args;
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if( !args )
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{
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printf("%s() get invalid arguments\n", __FUNCTION__);
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pthread_exit(NULL);
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}
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printf("Thread workder 2 [%ld] start running...\n", pthread_self());
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while(1)
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{
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if(0 != pthread_mutex_trylock(&ctx->lock) )
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{
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continue;
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}
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printf("---: %s before shared_var++: %d\n", __FUNCTION__, ctx->shared_var);
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ctx->shared_var ++;
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sleep(2);
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printf("---: %s after sleep shared_var: %d\n", __FUNCTION__, ctx->shared_var);
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pthread_mutex_unlock(&ctx->lock);
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sleep(1);
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}
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printf("Thread workder 2 exit...\n");
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return NULL;
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}
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