訊號量的互斥同步都是通過pv原語來操作的，我們可以通過註冊兩個訊號量，讓它們在互斥的問題上互動，從而達到同步。通過下面例項就可以很容易理解：
[cpp]view plain
copy
#include
#include
#include
#include
#include
#include
#define return_if_fail(p) if((p) == 0)
typedef
struct
_privinfo
privinfo;
static
void
info_init (privinfo* thiz);
static
void
info_destroy (privinfo* thiz);
static
void
* pthread_func_1 (privinfo* thiz);
static
void
* pthread_func_2 (privinfo* thiz);
intmain (
intargc,
char
** argv)
info_init (thiz);
ret = pthread_create (&pt_1, null, (void
*)pthread_func_1, thiz);
if(ret != 0)
ret = pthread_create (&pt_2, null, (void
*)pthread_func_2, thiz);
if(ret != 0)
pthread_join (pt_1, null);
pthread_join (pt_2, null);
info_destroy (thiz);
return
0;
}
static
void
info_init (privinfo* thiz)
static
void
info_destroy (privinfo* thiz)
static
void
* pthread_func_1 (privinfo* thiz)
return
;
}
static
void
* pthread_func_2 (privinfo* thiz)
return
;
}
pthread2: pthread2 get the unlock.
pthread2: pthread2 unlock.
pthread1: pthread1 get the lock.
pthread1: pthread1 unlock
pthread2: pthread2 get the unlock.
pthread2: pthread2 unlock.
pthread1: pthread1 get the lock.
pthread1: pthread1 unlock
pthread2: pthread2 get the unlock.
pthread2: pthread2 unlock.
pthread1: pthread1 get the lock.
pthread1: pthread1 unlock
pthread2: pthread2 get the unlock.
pthread2: pthread2 unlock.
pthread1: pthread1 get the lock.
pthread1: pthread1 unlock
pthread2: pthread2 get the unlock.
pthread2: pthread2 unlock.
pthread1: pthread1 get the lock.
pthread1: pthread1 unlock
pthread2: pthread2 get the unlock.
pthread2: pthread2 unlock.
pthread1: pthread1 get the lock.
pthread1: pthread1 unlock
pthread2: pthread2 get the unlock.
pthread2: pthread2 unlock.
pthread1: pthread1 get the lock.
pthread1: pthread1 unlock
pthread2: pthread2 get the unlock.
pthread2: pthread2 unlock.
pthread1: pthread1 get the lock.
pthread1: pthread1 unlock
pthread2: pthread2 get the unlock.
pthread2: pthread2 unlock.
pthread1: pthread1 get the lock.
pthread1: pthread1 unlock
pthread2: pthread2 get the unlock.
pthread2: pthread2 unlock.
pthread1: pthread1 get the lock.
pthread1: pthread1 unlock
多執行緒 訊號量
訊號量 semaphore類 建立帶指定許可數的訊號量 semaphore semaphore new semaphore 1 建立乙個許可的訊號量 訊號量用來限制訪問共享數資源的執行緒數。在訪問資源之前，執行緒必須從訊號量獲取許可，在訪問完資源後釋放訊號量。任務通過呼叫訊號量的acquire 方法...
Linux多執行緒同步 訊號量
同步主線程與子執行緒 子執行緒之間的同步 使用單個訊號量 include include include include include include void ret result thread1 void ret result thread2 sem t sem void thread1fun...
Linux 多執行緒訊號量同步
p操作 v操作 include sem t sem 定義訊號量 sem init 初始化訊號量 sem wait 獲取訊號量，訊號量的數值 1 訪問共享資源 sem post 釋放乙個訊號量，及訊號量的數值 1 sem destroy 如果不再使用訊號量，則銷毀訊號量函式和posix ipc的訊號量...