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Author: linw7

code/pthread_mutex_cond.c

@@ -0,0 +1,69 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <pthread.h>
+
+pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+pthread_cond_t ready = PTHREAD_COND_INITIALIZER;
+
+int traveler_cond = 0;
+
+void *traveler_arrive(void *name){
+	printf("traveler %s need a taxi now\n", (char *)name);
+	pthread_mutex_lock(&lock);
+	traveler_cond++;
+	pthread_cond_wait(&ready, &lock);
+	pthread_mutex_unlock(&lock);
+	printf("traveler %s now got a taxi\n", (char *)name);
+	pthread_exit((void *)0);
+}
+
+void *taxi_arrived(void *name){
+	printf("taxi %s arrives\n", (char *)name);
+	while(1){
+		pthread_mutex_lock(&lock);
+		if(traveler_cond > 0){
+			pthread_cond_signal(&ready);
+			pthread_mutex_unlock(&lock);
+			break;
+		}
+		pthread_mutex_unlock(&lock);
+	}
+	pthread_exit((void *)0);
+}
+
+int main(){
+	pthread_t tids[3];
+	int iRet = pthread_create(&tids[0], NULL, taxi_arrived, (void *)("Jack"));
+	if(iRet){
+		printf("pthread_create error : iRet = %d\n", iRet);
+		return iRet;
+	}
+	printf("time passing by\n");
+	sleep(1);
+	iRet = pthread_create(&tids[1], NULL, traveler_arrive, (void *)("Susan"));
+	if(iRet){
+		printf("pthread_create error : iRet = %d\n", iRet);
+		return iRet;
+	}
+	printf("time passing by\n");
+	sleep(1);
+	iRet = pthread_create(&tids[0], NULL, taxi_arrived, (void *)("Mike"));
+	if(iRet){
+		printf("pthread_create error : iRet = %d\n", iRet);
+		return iRet;
+	}
+	printf("time passing by\n");
+	sleep(1);
+	void *retval;
+	for(int i = 0; i < 3; i++){
+		iRet = pthread_join(tids[i], &retval);
+		if(iRet){
+			printf("pthread_join error : iRet = %d\n", iRet);
+			return iRet;
+		}
+		printf("retval = %ld\n", (long)retval);
+	}
+	return 0;
+}