futex全称是fast user-space locking,也就是快速用户空间锁,在linux下使用C语言写多线程程序时,在需要线程同步的地方会经常使用pthread_mutex_lock()函数对临界区进行加锁,如果加锁失败线程就会挂起,这就是互斥锁。但是pthread_mutex_lock并不是立即进行系统调用,而是首先在用户态进行CAS操作,判断其它线程是否已经获取...
static int __pthread_mutex_lock_full (pthread_mutex_t *mutex) __attribute_noinline__; int PTHREAD_MUTEX_LOCK (pthread_mutex_t *mutex) { /* See concurrency notes regarding mutex type which is loaded from __kind in struct __pthread_mutex_s in sysdeps/nptl/bits/thread-shared-types.h...
#0 __pthread_kill_implementation (no_tid=0, signo=6, threadid=140702902117952) at ./nptl/pthread_kill.c:44 #1 __pthread_kill_internal (signo=6, threadid=140702902117952) at ./nptl/pthread_kill.c:78 #2 __GI___pthread_kill (threadid=140702902117952, signo=signo@entry=6) at ./nptl/p...