那么加锁逻辑就变为: const(mutexLocked=1// mutex is lockedmutexWoken=2mutexWaiterShift=2)typeMutexstruct{stateint32semauint32}func(m*Mutex)Lock(){//给新来的协程直接加锁的机会ifatomic.CompareAndSwapInt32(&m.state,0,mutexLocked){return}//上面没有加锁成功,尝试在接下来的唤醒中去竞争锁awoke:...
const(mutexLocked=1// mutex is lockedmutexWoken=2mutexWaiterShift=2)type Mutex struct{state int32 sema uint32}func(m*Mutex)Lock(){//给新来的协程直接加锁的机会ifatomic.CompareAndSwapInt32(&m.state,0,mutexLocked){return}//上面没有加锁成功,尝试在接下来的唤醒中去竞争锁awoke:=false//表示当...
* Caller must lock the mutex. */gcc_pureboolIsStopped()const{ assert(mutex.IsLockedByCurrent());returnstop; } 开发者ID:Turbo87,项目名称:XCSoar-TE,代码行数:12,代码来源:StandbyThread.hpp 示例5: IsBusy ▲点赞 1▼ /** * Is the thread currently working (i.e. inside Tick())? * * C...
mutexWaiters //阻塞等待的waiter数量 mutexStariving //饥饿标记 mutexWoken //唤醒标记 mutexLocked //持有锁的标记 type Mutex struct { state int32 sema uint32 } type Locker interface { Lock() Unlock() } const ( mutexLocked = 1 << iota // mutex is locked mutexWoken mutexStarving // 从stat...
sema uint32}const(mutexLocked=1// mutex is lockedmutexWoken=2mutexWaiterShift=3mutexStarving=4//新增字段,标识)func(m*Mutex)Lock(){//给新来的协程直接加锁的机会ifatomic.CompareAndSwapInt32(&m.state,0,mutexLocked){return}m.lockSlow()}func(m*Mutex)lockSlow(){varwaitStartTime int64//表示等...
boolmutex_is_locked(struct mutex *lock) { return__mutex_owner(lock) !=NULL; } 很显而易见,mutex持有者不为NULL即表示锁定状态。 3 实际案例 实验: 输出: $> g++ -E test.c -o test.i $> g++ -S test.i -o test.s $> vim test.s ...
bool mutex_is_locked(struct mutex *lock) { return __mutex_owner(lock) != NULL; } 很显而易见,mutex持有者不为NULL即表示锁定状态。 3 实际案例 实验: #include <pthread.h> #include <stdio.h> #define LOOP 1000000 int cnt = 0;
mutexLocked =1<<iota// mutex is lockedmutexWoken mutexStarving mutexWaiterShift =iota// Mutex fairness./// Mutex can be in 2 modes of operations: normal and starvation.// In normal mode waiters are queued in FIFO order, but a woken up waiter// does not own the mutex and competes with...
The mutex object referenced by mutex is locked by calling pthread_mutex_lock(). If the mutex is already locked, the calling thread blocks until the mutex becomes available. This operation returns with the mutex object referenced by mutex in the locked state with the calling thread as its ...
// A Mutex is a mutual exclusion lock. // The zero value for a Mutex is an unlocked mutex. // // A Mutex must not be copied after first use. type Mutex struct { state int32 sema uint32 } // A Locker represents an object that can be locked and unlocked. ...