任何spinlock必须初始化 int pthread_spin_init(pthread_spinlock_t *lock,int pshared)请求OS对*lock初始化,分配资源,flag设为已开锁,将它的线程等待队列置为NULL.pshared有两个可选值 ◼ PTHREAD_PROCESS_SHARED:对*lock执行“加锁”的线程与当前线 程可以分别属于不同的进程。 ◼ PTHREAD_PROCESS_PRIVATE:...
1//Name: spinlockvsmutex1.cc2//Source:http://www.alexonlinux.com/pthread-mutex-vs-pthread-spinlock3//Compiler(spin lock version): g++ -o spin_version -DUSE_SPINLOCK spinlockvsmutex1.cc -lpthread4//Compiler(mutex version): g++ -o mutex_version spinlockvsmutex1.cc -lpthread5#include <stdi...
但即使这样, 一般来说,spinlock的开销还是比进程调度(context switch)少得多。这就是spin lock 被广泛应用在多处理器环境的原因 Pthreads提供的与Spin Lock锁操作相关的API主要有: pthread_spin_lock (pthread_spinlock_t *lock); pthread_spin_trylock (pthread_spinlock_t *lock); pthread_spin_unlock (pthread...
#include <pthread.h> int pthread_spin_lock(pthread_spinlock_t *lock); int pthread_spin_trylock(pthread_spinlock_t *lock); 說明 pthread_spin_lock子常式會鎖定lock參數所參照的旋轉鎖定。 如果另一個執行緒未保留鎖定,則呼叫端執行緒將獲得鎖定。 否則,在鎖定變成可用之前,執行緒會旋轉 (亦即,不會從pt...
pthread_spin_unlock(&cal_spinlock); } 开发者ID:HPDCS,项目名称:NPBQ,代码行数:22,代码来源:calqueue.c 示例6: my_free_hook ▲点赞 1▼ staticvoidmy_free_hook(void*ptr,constvoid*caller){pthread_spin_lock(&lock);/* Restore all old hooks */__malloc_hook = old_malloc_hook; ...
20 pthread_spinlock_t spinlock; 21 #else 22 pthread_mutex_t mutex; 23 #endif 24 25 //Get the thread id 26 pid_t gettid() { return syscall( __NR_gettid ); } 27 28 void *consumer(void *ptr) 29 { 30 int i; 31 32 printf("Consumer TID %lun", (unsigned long)gettid()); ...
intpthread_spin_destroy(pthread_spinlock_t*);2.初始化自旋锁 intpthread_spin_init(pthread_spinlock_t*,int); 3.自旋锁上锁(阻塞)intpthread_spin_lock(pthread_spinlock_t*); 4.自旋锁上锁(非阻塞)intpthread_spin_trylock(pthread_spinlock_t*); ...
typedef volatile int pthread_spinlock_t; 1. 2)pthread_spin_lock glibc-2.12.2\nptl\sysdeps\i386\pthread_spin_lock.c #ifndef LOCK_PREFIX # ifdef UP # define LOCK_PREFIX /* nothing */ # else # define LOCK_PREFIX "lock;" # endif
pthread_spin_lock(&spinlock); #else pthread_mutex_lock(&mutex); #endif if (the_list.empty()) { #ifdef USE_SPINLOCK pthread_spin_unlock(&spinlock); #else pthread_mutex_unlock(&mutex); #endif break; } i = the_list.front();
2 Pthread spinlock spinlock,也称自旋锁,是属于busy-waiting类型的锁.在多处理器环境中, 自旋锁最多只能被一个可执行线程持有。如果一个可执行线程试图获得一个被争用(已经被持有的)自旋锁,那么该线程就会一直进行忙等待,自旋,也就是空转,等待锁重新可用。如果锁未被争用,请求锁的执行线程便立刻得到它,继续执行...