如下图所示,当检测到死锁发生时,Task-2主动unlock(B),那么Task-1就可以继续往下执行,Task-1执行完后释放lock B和lock A,那么Task-2也可以继续往下执行。这种机制被命名为"ww-mutex",其中"ww"代表wound-wait,可理解为是主动让出mutex的一方在“受伤地等待”,不过一方受伤总比双方都死掉好。ww-mutex需要能够...
ww_mutex_unlock(&res_obj->lock); if (ret == -EDEADLK) { /* 在开始下一轮的加锁前,使用ww_mutex_lock_slow()获取上一轮有冲突的锁,ww_mutex_lock_slow()会一直休眠,直到该锁可用为止 */ /* we lost out in a seqno race, lock and retry.. */ ww_mutex_lock_slow(&contended_entry->...
nest_lock = &ww_ctx->dep_map; #endif } mutex_acquire_nest(&rtm->dep_map, 0, 0, nest_lock, ip);if (likely(rt_mutex_cmpxchg_acquire(&rtm->rtmutex, NULL, current))) { if (ww_ctx) ww_mutex_set_context_fastpath(lock, ww_ctx); ...
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Waiting for slave mutex on exit 当前线程停止了,这个时间很短。 Reading event from the relay log 从中继日志里读到一个事件以备执行。 Has read all relay log; waiting for the slave I/O thread to update it 已经处理完中继日志中的全部事件了,正等待I/O线程写入更新的日志。
"ecmascript/platform/common/mutex.cpp", "ecmascript/platform/common/filesystem.cpp", "ecmascript/platform/common/ffrt.cpp", ] config("include_llvm") { if (compile_llvm_online) { include_dirs = [ "//third_party/third_party_llvm-project/build/include", "//third_party/third_...
async-mutex@^0.5.0: version "0.5.0" resolved "https://registry.yarnpkg.com/async-mutex/-/async-mutex-0.5.0.tgz#353c69a0b9e75250971a64ac203b0ebfddd75482" integrity sha512-1A94B18jkJ3DYq284ohPxoXbfTA5HsQ7/Mf4DEhcyLx3Bz27Rh59iScbB6EPiP+B+joue6YCxcMXSbFC1tZKwA== dependencies...
ww_mutex_unlock(&entry->obj->lock); /* 与mutex_unlock类似 */ if (res_obj) ww_mutex_unlock(&res_obj->lock); if (ret == -EDEADLK) { /* 在开始下一轮的加锁前,使用ww_mutex_lock_slow()获取上一轮有冲突的锁,ww_mutex_lock_slow()会一直休眠,直到该锁可用为止 */ /* we lost out...
(resv == &**_resv**) except for imported GEM objects. _resv A reservation object for this GEM object. This is unused for imported GEM objects. GEM中对WW-Mutexes和dma-fence是通过dma_resv来实现的,dma_resv的定义如下: struct dma_resv { struct ww_mutex lock; seqcount_ww_mutex_t ...
spinlock, mutex_type_spinlock,0,0,0);CALL_FN_W_WW(ret, fn, spinlock, pshared);returnret; } 開發者ID:svn2github,項目名稱:valgrind-3,代碼行數:14,代碼來源:drd_pthread_intercepts.c 示例6: sem_timedwait_intercept ▲點讚 1▼ static__always_inlineintsem_timedwait_intercept(sem_t*sem,const...