线程相关函数(5)-pthread_rwlock_rdlock(),pthread_rwlock_wrlock() 读写锁
读共享,写独占
pthread_rwlock_t
pthread_rwlock_init
pthread_rwlock_destroy
pthread_rwlock_rdlock
pthread_rwlock_wrlock
pthread_rwlock_tryrdlock
pthread_rwlock_trywrlock
pthread_rwlock_unlock
示例代码:
#include <pthread.h> #include <stdio.h> #include <unistd.h> static int counter; static pthread_rwlock_t rwlock; void *th_write(void *arg) { int t, i; for (i=0; i<5; i++) { pthread_rwlock_wrlock(&rwlock); t = counter; usleep(100); printf("Write Thread(%x) counter=%d, ++counter=%d\n", (int)pthread_self(), t, ++counter); pthread_rwlock_unlock(&rwlock); usleep(100); } } void *th_read(void *arg) { while(1) { pthread_rwlock_rdlock(&rwlock); printf("Read Thread(%x) counter=%d\n", (int)pthread_self(), counter); pthread_rwlock_unlock(&rwlock); usleep(100); } } int main() { int i; pthread_t tid[8]; pthread_rwlock_init(&rwlock, NULL); for (i=0; i<3; i++) pthread_create(&tid[i], NULL, th_write, NULL); for (i=0; i<5; i++) pthread_create(&tid[i+3], NULL, th_read, NULL); for (i=0; i<8; i++) pthread_join(tid[i], NULL); pthread_rwlock_destroy(&rwlock); return 0; }
运行结果:
Read Thread(f901e700) counter=0
Read Thread(f981f700) counter=0
Read Thread(f881d700) counter=0
Read Thread(fa020700) counter=0
Read Thread(fa821700) counter=0
Write Thread(fb022700) counter=0, ++counter=1
Write Thread(fb823700) counter=1, ++counter=2
Write Thread(fc024700) counter=2, ++counter=3
Write Thread(fb022700) counter=3, ++counter=4
Write Thread(fb823700) counter=4, ++counter=5
Write Thread(fc024700) counter=5, ++counter=6
Write Thread(fb022700) counter=6, ++counter=7
Write Thread(fb823700) counter=7, ++counter=8
Write Thread(fc024700) counter=8, ++counter=9
Write Thread(fb022700) counter=9, ++counter=10
Write Thread(fb823700) counter=10, ++counter=11
Write Thread(fc024700) counter=11, ++counter=12
Write Thread(fb022700) counter=12, ++counter=13
Write Thread(fb823700) counter=13, ++counter=14
Write Thread(fc024700) counter=14, ++counter=15
Read Thread(f901e700) counter=15
Read Thread(f981f700) counter=15
Read Thread(f881d700) counter=15
Read Thread(fa020700) counter=15
Read Thread(fa821700) counter=15
Read Thread(f901e700) counter=15
Read Thread(f981f700) counter=15
Read Thread(f881d700) counter=15
Read Thread(fa020700) counter=15
...
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