C：你如何申报使用POSIX线程递归互斥？ [英] C: How do you declare a recursive mutex with POSIX threads?

问题描述

我如何使用声明的pthread递归互斥有点糊涂了。
我尝试做的是只有一个线程在同一时间内能够运行一段code（包括功能），但持怀疑态度之​​后，我想通了，使用互斥锁是行不通的，而且不是我应该使用递归互斥。这里是我的code：

I am a bit confused on how to declare a recursive mutex using pthread. What I try to do is have only one thread at a time be able to run a piece of code(including functions) but after scepticism I figured out that the use of mutexes would not work and that instead I should use recursive mutexes. Here is my code:

pthread_mutex_lock(&mutex);                   // LOCK

item = queue_peek(queue);                     // get last item in queue
item_buff=item;                               // save item to a buffer
queue_removelast(queue);                      // remove last item from queue

pthread_mutex_unlock(&mutex);                 // UNLOCK

所以我尝试做的是刚读/从队列中删除串行

So what I try to do is just read/remove from the queue serially.

的事情是，没有任何的例子在那里就如何申报递归互斥体。或者，也许有几个，但他们不编译我的。

The thing is that there isn't any example out there on how to declare recursive mutexes. Or there maybe a few but they don't compile for me.

推荐答案

code迈克尔Foukarakis几乎是好的，但他两次初始化互斥导致未定义的行为。它应该只是这样的：

Code from Michael Foukarakis is almost good but he initializes mutex twice which leads to undefined behavior. It should be just like that:

pthread_mutex_t Mutex;
pthread_mutexattr_t Attr;

pthread_mutexattr_init(&Attr);
pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&Mutex, &Attr);

我实际上可以用于生产该code，我知道它正常工作在Linux，Solaris，HP-UX，AIX，Mac OSX和FreeBSD的。

I acutally uses this code in production, and I know it works correctly on Linux, Solaris, HP-UX, AIX, Mac OSX and FreeBSD.

/编辑

您还需要添加适当的链接器标志编译此。


AIX，Linux和FreeBSD的：

CPLATFORM + = -pthread



mingw32的：

LDFLAGS + = -lpthread

You also need to add proper linker flag to compile this.

AIX, Linux, FreeBSD:
CPLATFORM += -pthread

mingw32:
LDFLAGS += -lpthread

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