pnp_list_lock.c File Reference

#include "audiosrv.h"
#include <assert.h>

Include dependency graph for pnp_list_lock.c:

Go to the source code of this file.

Functions
BOOL	InitializeAudioDeviceListLock (VOID)
VOID	KillAudioDeviceListLock (VOID)
VOID	LockAudioDeviceList (VOID)
VOID	UnlockAudioDeviceList (VOID)

Variables
static HANDLE	audio_device_list_lock = NULL

Function Documentation

InitializeAudioDeviceListLock()

BOOL InitializeAudioDeviceListLock

(

VOID

)

Definition at line 15 of file pnp_list_lock.c.

{
    /* The security stuff is to make sure the mutex can be grabbed by
       other processes - is this the best idea though ??? */
 
    SECURITY_DESCRIPTOR security_descriptor;
    SECURITY_ATTRIBUTES security;
 
    InitializeSecurityDescriptor(&security_descriptor, SECURITY_DESCRIPTOR_REVISION);
    SetSecurityDescriptorDacl(&security_descriptor, TRUE, 0, FALSE);
 
    security.nLength = sizeof(SECURITY_ATTRIBUTES);
    security.lpSecurityDescriptor = &security_descriptor;
    security.bInheritHandle = FALSE;
 
    audio_device_list_lock = CreateMutex(&security,
                                         FALSE,
                                         AUDIO_LIST_LOCK_NAME);
 
    return (audio_device_list_lock != NULL);
}

Referenced by CreateAudioDeviceList().

KillAudioDeviceListLock()

VOID KillAudioDeviceListLock

(

VOID

)

Definition at line 38 of file pnp_list_lock.c.

{
    CloseHandle(audio_device_list_lock);
    audio_device_list_lock = NULL;
}

Referenced by CreateAudioDeviceList(), and DestroyAudioDeviceList().

LockAudioDeviceList()

VOID LockAudioDeviceList

(

VOID

)

Definition at line 45 of file pnp_list_lock.c.

{
    assert(audio_device_list_lock != NULL);
    WaitForSingleObject(audio_device_list_lock, INFINITE);
}

Referenced by AppendAudioDeviceToList(), CreateAudioDeviceList(), and DestroyAudioDeviceList().

UnlockAudioDeviceList()

VOID UnlockAudioDeviceList

(

VOID

)

Definition at line 52 of file pnp_list_lock.c.

{
    assert(audio_device_list_lock != NULL);
    ReleaseMutex(audio_device_list_lock);
}

Referenced by AppendAudioDeviceToList(), CreateAudioDeviceList(), and DestroyAudioDeviceList().

Variable Documentation

audio_device_list_lock

HANDLE audio_device_list_lock = NULL

static

Definition at line 12 of file pnp_list_lock.c.

Referenced by InitializeAudioDeviceListLock(), KillAudioDeviceListLock(), LockAudioDeviceList(), and UnlockAudioDeviceList().