1 // Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // Name     : sem_post.cpp

    15 // Part of  : PThread library

    16 // sem_post call is implemented.

    17 // Version:

    18 //

    19 

    20 

    21 

    22 #include <e32def.h>

    23 #include <errno.h>

    24 

    25 #include "semaphore.h"

    26 #include "semaphoretypes.h"

    27 #include "pthread.h"

    28 

    29 EXPORT_C int sem_post (sem_t * sem)

    30 {

    31     if (!sem || !(*sem))

    32     {

    33         errno = EINVAL;

    34         return -1;

    35     }

    36 

    37     _sem_t* gsem = *sem;

    38     if(gsem->iState != _sem_t::EInitialized)

    39     {

    40         errno = EINVAL;

    41         return -1;

    42     }

    43 

    44     gsem->iMutex.Wait();

    45     if(gsem->iState != _sem_t::EInitialized)

    46     {

    47         errno = EINVAL;

    48         return -1;

    49     }

    50 

    51     int count = ++(gsem->iCount);

    52 

    53     if(count <=0)

    54     {

    55         //blocked waiters

    56         gsem->iSemaphore.Signal(); 

    57     }

    58     gsem->iMutex.Signal();

    59     return 0;

    60 }//sem_post()

    61 

    62 //End of File