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Article View: borland.public.cppbuilder.nativeapi
Article #1315

Differences between Semaphore and Mutex

#1315
From: Danny
Date: Sun, 16 Sep 2007 07:08
44 lines
1779 bytes
Hi all,

I must to synchronize two threads, but I've a problem with the mutex 
procedures.

In the following code I've used the semaphores...:

1# thread
HANDLE h=::CreateSemaphore(NULL,0,1,"PddSem");
.......
execute the #2 thread
.......
::WaitForSingleObject(h,INFINITE);
::CloseHandle(h);

2# thread
.......
HANDLE h=::OpenSemaphore(SEMAPHORE_ALL_ACCESS,false,"PddSem");
::ReleaseSemaphore(h,1,NULL);
::CloseHandle(h);

...ans work all fine, but if I use the mutexs...:

1# thread
HANDLE h=::CreateMutex(NULL,true,"PddMut");
.......
execute the #2 thread
.......
::WaitForSingleObject(h,INFINITE);
::CloseHandle(h);

2# thread
.......
HANDLE h=::OpenMutex(MUTEX_ALL_ACCESS,false,"PddMut");
::ReleaseMutex(h);
::CloseHandle(h);

...the #1 thread don't wait the #2 thread.


Currently I've solved my problem with the semaphores, but someone could 
explain me the differences.

Thanks 
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Subject: Differences between Semaphore and Mutex
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