pthread_rwlock_rdlock 函数将读锁定应用于 rwlock引用的 read-write 锁定。 如果写程序未持有锁定,并且没有任何写程序被锁定,那么调用线程将获取 read 锁定。 未指定在写程序没有保留该锁且有写程序在等待该锁时调用线程是否要获取该锁。 如果写程序保留了该锁,调用线程将不会获取该读取锁。 如果未获取读锁定,那...
百度试题 结果1 题目:pthread_rwlock_rdlock是对读写锁进行___操作。 A. 加锁 B. 解锁 C. 加读琐 D. 加写锁 相关知识点: 试题来源: 解析 C 反馈 收藏
pthread_rwlock_rdlock () 函数将读锁定应用于rwlock引用的读或写锁定。 如果写程序未持有该锁,并且该锁上没有被阻止的写程序,那么调用线程将获取读锁。 在z/OS UNIX中,当写程序未持有该锁定并且有写程序等待该锁定时,调用线程不会获取该锁定,除非该线程已持有rwlock以供读取。 它将阻塞并等待直到没有写程序挂...
pthread_rwlock_rdlock(&rwlock); printf("Read Thread(%x) counter=%d\n", (int)pthread_self(), counter); pthread_rwlock_unlock(&rwlock); usleep(100); } }intmain() {inti; pthread_t tid[8]; pthread_rwlock_init(&rwlock, NULL);for(i=0; i<3; i++) pthread_create(&tid[i], NULL, ...
Return Value If successful,pthread_rwlock_rdlock()returns zero. Otherwise, an error number is returned to indicate the error. EINVAL The value specified byattrorrwlockis invalid.
If so, the thread must perform matching unlocks (that is, it must call the pthread_rwlock_unlock() function n times). The function pthread_rwlock_tryrdlock() applies a read lock as in the pthread_rwlock_rdlock() function with the exception that the function fails if any thread holds a ...
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_...
pthread_rwlock_rdlock和“No such file or directory”调用pthread_rwlock_rdlock时,如果失败报错“pthread_rwlock_rdlock”,则可能是因为对同一把锁先加了写锁,再加读锁时就报这个错误了。...
rwlock_destroy' /home/cathal/torch-cl/install/lib/libclBLAS.so: undefined reference to `pthread_rwlock_rdlock' /home/cathal/torch-cl/install/lib/libclBLAS.so: undefined reference to `pthread_rwlock_init' /home/cathal/torch-cl/install/lib/libclBLAS.so: undefined reference to `pthread_rwlock_...
If successful, pthread_rwlock_rdlock() returns 0. If unsuccessful, pthread_rwlock_rdlock() returns -1 and sets errno to one of the following values: Error Code Description EAGAIN The read lock could not be acquired because the maximum number of read locks forrwlockhas been exceeded. T...