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/* $Id: kLdrDyldSem.c 29 2009-07-01 20:30:29Z bird $ */
/** @file
* kLdr - The Dynamic Loader, Semaphore Helper Functions.
*/
/*
* Copyright (c) 2006-2007 Knut St. Osmundsen <bird-kStuff-spamix@anduin.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include <k/kDefs.h>
#include <k/kHlpSem.h>
#include <k/kHlpAssert.h>
#if K_OS == K_OS_DARWIN
# include <mach/mach.h>
# undef mach_task_self /* don't use the macro (if we're using bare helpers ) */
#elif K_OS == K_OS_OS2
# define INCL_BASE
# define INCL_ERRORS
# include <os2.h>
#elif K_OS == K_OS_WINDOWS
# include <Windows.h>
#else
# error "port me"
#endif
/*******************************************************************************
* Global Variables *
*******************************************************************************/
#if K_OS == K_OS_DARWIN
/** The loader sempahore. */
static semaphore_t g_Semaphore = MACH_PORT_NULL;
#elif K_OS == K_OS_OS2
/** The loader sempahore. */
static HMTX g_hmtx;
#elif K_OS == K_OS_WINDOWS
/** The loader sempahore. */
static CRITICAL_SECTION g_CritSect;
#else
# error "port me"
#endif
/**
* Initializes the loader semaphore.
*
* @returns 0 on success, non-zero OS status code on failure.
*/
int kLdrDyldSemInit(void)
{
#if K_OS == K_OS_DARWIN
kern_return_t krc;
krc = semaphore_create(mach_task_self(), &g_Semaphore, SYNC_POLICY_FIFO, 0);
if (krc != KERN_SUCCESS)
return krc;
#elif K_OS == K_OS_OS2
APIRET rc;
g_hmtx = NULLHANDLE;
rc = DosCreateMutexSem(NULL, &g_hmtx, 0, FALSE);
if (rc)
return rc;
#elif K_OS == K_OS_WINDOWS
InitializeCriticalSection(&g_CritSect);
#else
# error "port me"
#endif
return 0;
}
/**
* Terminates the loader semaphore.
*/
void kLdrDyldSemTerm(void)
{
#if K_OS == K_OS_DARWIN
kern_return_t krc;
semaphore_t Semaphore = g_Semaphore;
g_Semaphore = MACH_PORT_NULL;
krc = semaphore_destroy(mach_task_self(), Semaphore);
kHlpAssert(krc == KERN_SUCCESS); (void)krc;
#elif K_OS == K_OS_OS2
HMTX hmtx = g_hmtx;
g_hmtx = NULLHANDLE;
DosCloseMutexSem(hmtx);
#elif K_OS == K_OS_WINDOWS
DeleteCriticalSection(&g_CritSect);
#else
# error "port me"
#endif
}
/**
* Requests the loader sempahore ownership.
* This can be done recursivly.
*
* @returns 0 on success, non-zero OS status code on failure.
*/
int kLdrDyldSemRequest(void)
{
#if K_OS == K_OS_DARWIN
/* not sure about this... */
kern_return_t krc;
do krc = semaphore_wait(g_Semaphore);
while (krc == KERN_ABORTED);
if (krc == KERN_SUCCESS)
return 0;
return krc;
#elif K_OS == K_OS_OS2
APIRET rc = DosRequestMutexSem(g_hmtx, 5000);
if (rc == ERROR_TIMEOUT || rc == ERROR_SEM_TIMEOUT || rc == ERROR_INTERRUPT)
{
unsigned i = 0;
do
{
/** @todo check for deadlocks etc. */
rc = DosRequestMutexSem(g_hmtx, 1000);
} while ( ( rc == ERROR_TIMEOUT
|| rc == ERROR_SEM_TIMEOUT
|| rc == ERROR_INTERRUPT)
&& i++ < 120);
}
return rc;
#elif K_OS == K_OS_WINDOWS
EnterCriticalSection(&g_CritSect);
return 0;
#else
# error "port me"
#endif
}
/**
* Releases the loader semaphore ownership.
* The caller is responsible for making sure it's the semaphore owner!
*/
void kLdrDyldSemRelease(void)
{
#if K_OS == K_OS_DARWIN
/* not too sure about this... */
kern_return_t krc = semaphore_signal(g_Semaphore);
kHlpAssert(krc == KERN_SUCCESS); (void)krc;
#elif K_OS == K_OS_OS2
APIRET rc = DosReleaseMutexSem(g_hmtx);
kHlpAssert(!rc); (void)rc;
#elif K_OS == K_OS_WINDOWS
LeaveCriticalSection(&g_CritSect);
#else
# error "port me"
#endif
}
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