#include "pa_cpuload.h"
#include <assert.h>
#include <pthread.h>
#include <signal.h>

Data Structures
struct	PaUtilThreading

struct	PaUnixMutex

struct	PaUnixThread

Macros
#define	PA_MIN(x, y) ( (x) < (y) ? (x) : (y) )

#define	PA_MAX(x, y) ( (x) > (y) ? (x) : (y) )

#define	UNLIKELY(expr) (expr)

#define	STRINGIZE_HELPER(expr) #expr

#define	STRINGIZE(expr) STRINGIZE_HELPER(expr)

#define	PA_UNLESS(expr, code)

#define	PA_ENSURE(expr)

#define	PA_ASSERT_CALL(expr, success)

#define	PA_ENSURE_SYSTEM(expr, success)

#define	PaUnixThreading_EXIT(result)

Functions
PaError	PaUtil_InitializeThreading (PaUtilThreading *threading)

void	PaUtil_TerminateThreading (PaUtilThreading *threading)

PaError	PaUtil_StartThreading (PaUtilThreading threading, void (threadRoutine)(void ), void *data)

PaError	PaUtil_CancelThreading (PaUtilThreading threading, int wait, PaError exitResult)

PaError	PaUnixMutex_Initialize (PaUnixMutex *self)

PaError	PaUnixMutex_Terminate (PaUnixMutex *self)

PaError	PaUnixMutex_Lock (PaUnixMutex *self)

PaError	PaUnixMutex_Unlock (PaUnixMutex *self)

PaError	PaUnixThreading_Initialize ()

PaError	PaUnixThread_New (PaUnixThread self, void (threadFunc)(void ), void *threadArg, PaTime waitForChild, int rtSched)

PaError	PaUnixThread_Terminate (PaUnixThread self, int wait, PaError exitResult)

PaError	PaUnixThread_PrepareNotify (PaUnixThread *self)

PaError	PaUnixThread_NotifyParent (PaUnixThread *self)

int	PaUnixThread_StopRequested (PaUnixThread *self)

Variables
pthread_t	paUnixMainThread

Macro Definition Documentation

#define PA_ASSERT_CALL	(	expr,
		success
	)

Value:

paUtilErr_ = (expr); \

assert( success == paUtilErr_ );

Referenced by PaUnixMutex_Initialize(), PaUnixMutex_Terminate(), PaUnixThread_New(), and PaUnixThread_Terminate().

#define PA_ENSURE ( expr )

Value:

do { \
        if( UNLIKELY( (paUtilErr_ = (expr)) < paNoError ) ) \
        { \
            PaUtil_DebugPrint(( "Expression '" #expr "' failed in '" __FILE__ "', line: " STRINGIZE( __LINE__ ) "\n" )); \
            result = paUtilErr_; \
            goto error; \
        } \
    } while (0);

Referenced by PaAlsa_GetStreamInputCard(), PaAlsa_GetStreamOutputCard(), PaAlsa_Initialize(), PaOSS_Initialize(), PaUnixThread_New(), PaUnixThread_NotifyParent(), and PaUnixThread_PrepareNotify().

#define PA_ENSURE_SYSTEM	(	expr,
		success
	)

Value:

do { \
        if( UNLIKELY( (paUtilErr_ = (expr)) != success ) ) \
        { \
            /* PaUtil_SetLastHostErrorInfo should only be used in the main thread */ \
            if( pthread_equal(pthread_self(), paUnixMainThread) ) \
            { \
                PaUtil_SetLastHostErrorInfo( paALSA, paUtilErr_, strerror( paUtilErr_ ) ); \
            } \
            PaUtil_DebugPrint( "Expression '" #expr "' failed in '" __FILE__ "', line: " STRINGIZE( __LINE__ ) "\n" ); \
            result = paUnanticipatedHostError; \
            goto error; \
        } \
    } while( 0 );

Referenced by PaUnixMutex_Lock(), PaUnixMutex_Unlock(), PaUnixThread_New(), and PaUnixThread_Terminate().

#define PA_MAX	(	x,
		y
	)	( (x) > (y) ? (x) : (y) )

#define PA_MIN	(	x,
		y
	)	( (x) < (y) ? (x) : (y) )

Referenced by PaUnixThread_New().

#define PA_UNLESS	(	expr,
		code
	)

Value:

do { \
        if( UNLIKELY( (expr) == 0 ) ) \
        { \
            PaUtil_DebugPrint(( "Expression '" #expr "' failed in '" __FILE__ "', line: " STRINGIZE( __LINE__ ) "\n" )); \
            result = (code); \
            goto error; \
        } \
    } while (0);

Referenced by PaAlsa_GetStreamInputCard(), PaAlsa_GetStreamOutputCard(), PaAlsa_Initialize(), PaOSS_Initialize(), PaUnixThread_New(), PaUnixThread_NotifyParent(), PaUnixThread_PrepareNotify(), and PaUtil_InitializeDeviceInfo().

#define PaUnixThreading_EXIT ( result )

Value:

do { \
        PaError* pres = NULL; \
        if( paNoError != (result) ) \
        { \
            pres = malloc( sizeof (PaError) ); \
            *pres = (result); \
        } \
        pthread_exit( pres ); \
    } while (0);

Perish, passing on eventual error code.

A thin wrapper around pthread_exit, will automatically pass on any error code to the joining thread. If the result indicates an error, i.e. it is not equal to paNoError, this function will automatically allocate a pointer so the error is passed on with pthread_exit. If the result indicates that all is well however, only a NULL pointer will be handed to pthread_exit. Thus, the joining thread should check whether a non-NULL result pointer is obtained from pthread_join and make sure to free it.

Parameters

result,: The error code to pass on to the joining thread.

#define STRINGIZE ( expr ) STRINGIZE_HELPER(expr)

#define STRINGIZE_HELPER ( expr ) #expr

#define UNLIKELY ( expr ) (expr)

Function Documentation

PaError PaUnixMutex_Initialize ( PaUnixMutex * self )

References PA_ASSERT_CALL, and paNoError.

Referenced by PaUnixThread_New().

PaError PaUnixMutex_Lock ( PaUnixMutex * self )

Lock mutex.

We're disabling thread cancellation while the thread is holding a lock, so mutexes are properly unlocked at termination time.

References PA_ENSURE_SYSTEM, and paNoError.

Referenced by PaUnixThread_New(), PaUnixThread_NotifyParent(), and PaUnixThread_PrepareNotify().

PaError PaUnixMutex_Terminate ( PaUnixMutex * self )

References PA_ASSERT_CALL, and paNoError.

Referenced by PaUnixThread_Terminate().

PaError PaUnixMutex_Unlock ( PaUnixMutex * self )

Unlock mutex.

Thread cancellation is enabled again after the mutex is properly unlocked.

References PA_ENSURE_SYSTEM, and paNoError.

Referenced by PaUnixThread_New(), and PaUnixThread_NotifyParent().

PaError PaUnixThread_New	(	PaUnixThread *	self,
		void ()(void *)	threadFunc,
		void *	threadArg,
		PaTime	waitForChild,
		int	rtSched
	)

Spawn a thread.

Intended for spawning the callback thread from the main thread. This function can even block (for a certain time or indefinitely) untill notified by the callback thread (using PaUnixThread_NotifyParent), which can be useful in order to make sure that callback has commenced before returning from Pa_StartStream.

Parameters

threadFunc,:	The function to be executed in the child thread.
waitForChild,:	If not 0, wait for child thread to call PaUnixThread_NotifyParent. Less than 0 means wait for ever, greater than 0 wait for the specified time.
rtSched,:	Enable realtime scheduling?

Returns: : If timed out waiting on child, paTimedOut.

References PA_ASSERT_CALL, PA_DEBUG, PA_ENSURE, PA_ENSURE_SYSTEM, PA_MIN, PA_UNLESS, paInternalError, paNoError, paTimedOut, PaUnixMutex_Initialize(), PaUnixMutex_Lock(), PaUnixMutex_Unlock(), PaUnixThread_Terminate(), and PaUtil_GetTime().

PaError PaUnixThread_NotifyParent ( PaUnixThread * self )

Notify waiting parent thread.

Returns: : If parent timed out waiting, paTimedOut. If parent was never waiting, paInternalError.

References PA_ENSURE, PA_UNLESS, paInternalError, paNoError, PaUnixMutex_Lock(), and PaUnixMutex_Unlock().

PaError PaUnixThread_PrepareNotify ( PaUnixThread * self )

Prepare to notify waiting parent thread.

An internal lock must be held before the parent is notified in PaUnixThread_NotifyParent, call this to acquire it beforehand.

Returns: : If parent is not waiting, paInternalError.

References PA_ENSURE, PA_UNLESS, paInternalError, paNoError, and PaUnixMutex_Lock().

int PaUnixThread_StopRequested ( PaUnixThread * self )

Has the parent thread requested this thread to stop?

PaError PaUnixThread_Terminate	(	PaUnixThread *	self,
		int	wait,
		PaError *	exitResult
	)

Terminate thread.

Parameters

wait,:	If true, request that background thread stop and wait untill it does, else cancel it.
exitResult,:	If non-null this will upon return contain the exit status of the thread.

References PA_ASSERT_CALL, PA_DEBUG, PA_ENSURE_SYSTEM, paNoError, and PaUnixMutex_Terminate().

Referenced by PaUnixThread_New().

PaError PaUnixThreading_Initialize ( )

Initialize global threading state.

References paNoError.

Referenced by PaAlsa_Initialize(), and PaAsiHpi_Initialize().