Multiple processes, Shared memory + read-write lock control, the process of 20, have individual process blocking jammed state, and then use gstack command to view the process or the GDB attach hang process with a block not continue to go down again, knock gstack command displays the blocked on pthread_rwlock_wrlock function, then process to run back to normal, otherwise has been blocking state

CodePudding user response:

Pthread_rwlock Shared memory is used to implement process between the lock? , I only know that in the Shared memory used pthread_mutex_t + condition variables can realize mutual exclusion, also need to set pthread_mutexattr_setrobust_np, also have to deal with the process after locking the influence of abnormal exit are (not),

Like you have the owner didn't see pthread_rwlock exception handling mechanism of quitting,
Suggested use: cache file + flock to achieve interprocess read-write lock
Or use sys_v semphore implementation