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PIPlat.h
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/*____________________________________________________________________________*\
*
Copyright (c) 1997 John Roy. All rights reserved.
These sources, libraries and applications are
FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
as long as the following conditions are adhered to.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. Redistributions of any form whatsoever and all advertising materials
mentioning features must contain the following
acknowledgment:
"This product includes software developed by John Roy
(http://www.johnroy.com/pi3/)."
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHORS OR ITS CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
OF THE POSSIBILITY OF SUCH DAMAGE.
*____________________________________________________________________________*|
*
* $Source: PIPlat.h$
* $Date: Sun Aug 10 06:29:37 1997$
*
Description:
Definition of platform specific functions.
\*____________________________________________________________________________*/
/* $HeaderTop:$ */
#ifndef PIPLAT_H_
#define PIPLAT_H_
#include "PiAPI.h"
#include "PISync.h"
#include "PIThread.h"
/*____________________________________________________________________________*\
*
Typedefs:
\*____________________________________________________________________________*/
typedef void (* PIPlatformFn)(void);
#define PIPLATFORM_VERSION_1_0 100
#define PIPLATFORM_POLL_READ 0x1
#define PIPLATFORM_POLL_WRITE 0x2
#define PIPLATFORM_POLL_NOTIMEOUT (-1)
#define PIPLATFORM_POLL_NOWAIT (0)
#define PIPLATFORM_FD int /* a regular file descriptor */
#define PIPLATFORM_NETFD int /* a network file descriptor */
#define PIPLATFORM_FD_INVALID ((PIPLATFORM_FD)-1)
#define PIPLATFORM_TIME int /* should be time_t */
/*____________________________________________________________________________*\
*
Name:
PIPlatform_enter
Synopsis:
int PIPlatform_enter( const char *pArgv0, int iVersion, PIPlatformFn fn )
Description:
Initializes the platform facilities including user context threads
and custom memory management, then calls the user supplied function
fn. PIPlatform_enter() cleans platform facilities before returning.
Notes:
The parameter pArgv0 should be passed argv[0] from the main() entry
point to the program, as certain implementations of dynamic loading
require this. However this is not essential to the functioning of
most platform functionality and NULL may be passed instead.
The constant PLATFORM_VERSION_1_0 should be used as parameter iVersion
to this function.
A typical use of this function is to invoke it immediately on entering
main() or equivalent function.
The function fn is run in the main thread with initial priority
PITHREAD_PRIORIY_MED.
<!--
*/
#if 0
--><PRE>
/* --- globals --- */
int iArgc;
char **ppArgv;
int iRet;
/* --- Main program function --- */
void foo()
{
/* ... */
iRet = 0;
}
/* --- initialize the platform and invoke foo() --- */
int main( int iArgc, char *ppArgv[] )
{
iArgc = iTheArgc;
ppArgv = ppTheArgv;
if ( PIPlatform_enter( ppArgv[0], PLATFORM_VERSION_1_0, foo ) )
{
printf( "Error initializing platform\n" );
return 0;
};
return iRet;
}
</PRE>
<!--
#endif
/*
-->
Return Values:
PIPlatform_enter() returns zero (PIAPI_COMPLETED) on success.
Errors:
On error PIPlatform_enter() returns a negative value.
More error information can be retrieved using PIPlatform_getLastError().
See Also:
PIPlatform_getDescription().
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_enter( const char *pArgv0, int iVersion,
PIPlatformFn fn );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_getDescription
Synopsis:
const char *PIPlatform_getDescription()
Description:
Returns a string which describes the range of operating systems
and machine/processor sets for which this build is compatible.
Notes:
The description is of the form
Operating system ( machine processor )
Return Values:
Returns an internally allocated pointer to a string. The caller should
not modify this string.
Errors:
PIPlatform_getDescription returns NULL if PIPlatform_Init() has not
been called.
More error information can be retrieved using PIPlatform_getLastError().
See Also:
PIPlatform_enter().
\*____________________________________________________________________________*/
PUBLIC_PIAPI const char *PIPlatform_getDescription();
/*____________________________________________________________________________*\
*
Name:
PIPlatform_allocLocalMutex
Synopsis:
PISync *PIPlatform_allocLocalMutex()
Description:
Returns a new local mutex which can be used to synchronize threads of
control within a process.
Notes:
The synchronization object should be destroyed using PISync_delete() when
it is no longer needed.
Return Values:
Returns a pointer to a new synchronization object or NULL on error.
Errors:
NULL may be returned if a new syncronization object could not be
created due to exhausted memory, kernel mutexes or user mutexes.
More information can be retrieved using PIPlatform_getLastError().
See Also:
PISync_lock(), PISync_unlock(), PISync_tryLock(), PISync_delete().
\*____________________________________________________________________________*/
PUBLIC_PIAPI PISync *PIPlatform_allocLocalMutex();
/*____________________________________________________________________________*\
*
Name:
PIPlatform_allocLocalSemaphore
Synopsis:
PISync *PIPlatform_allocLocalSemaphore( int iInitalCount, int iMaxCount )
Description:
Returns a new local semaphore which can be used to synchronize
threads of control within a process.
Notes:
The synchronization object should be destroyed using PISync_delete() when
it is no longer needed.
Return Values:
Returns a pointer to a new synchronization object or NULL on error.
Errors:
NULL may be returned if a new syncronization object could not be
created due to exhausted memory, kernel semaphores or user semaphores.
More specific error information can be retrieved using
PIPlatform_getLastError().
See Also:
PISync_lock(), PISync_unlock(), PISync_tryLock(), PISync_delete().
\*____________________________________________________________________________*/
PUBLIC_PIAPI PISync *PIPlatform_allocLocalSemaphore( int iInitialCount,
int iMaxCount );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_pollNetFD
Synopsis:
int PIPlatform_pollNetFD( PIPLATFORM_NETFD fdSocket, int iFlags,
int iTimeout )
Description:
Waits for the activity on the specified network file descriptor
(socket). The value iFlags is formed by OR'ing together any
combination of the values PIPLATFORM_POLL_READ and PIPLATFORM_POLL_WRITE.
The value piTimeout is a pointer to an integer containing a time to
wait in seconds.
Notes:
A value of PIPLATFORM_NOTIMEOUT for iTimeout specifies no timeout.
A value of PIPLATFORM_NOWAIT for iTimeout specifies that
PIPlatform_pollNetFD() should test for activity on fdSocket but return
immediately even if there is none.
Return Values:
On success PIPlatform_pollNetFD() returns a value formed by OR'ing
some of the values PIPLATFORM_POLL_READ and PIPLATFORM_POLL_WRITE together
indicating which operations may be performed on socket fdSocket
without blocking.
If the specified timeout period expires, PIPlatform_pollNetFD() returns
a value of zero.
Errors:
On failure PIPlatform_pollNetFD() returns a negative value.
More specific error information can be retreived using
PIPlatform_getLastError().
See Also:
PIPlatform_pollFD(), PIPlatform_pollPipeFD(), PIPlatform_sleep().
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_pollNetFD( PIPLATFORM_NETFD fdSocket, int iFlags,
int iTimeout );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_pollPipeFD
Synopsis:
int PIPlatform_pollPipeFD( PIPLATFORM_FD fd, int iFlags,
int iTimeout )
Description:
Waits for activity on the specified pipe.
The value iFlags is formed by OR'ing together any
combination of the values PIPLATFORM_POLL_READ and PIPLATFORM_POLL_WRITE.
The value piTimeout is a pointer to an integer containing a time to
wait in seconds.
Notes:
A value of PIPLATFORM_NOTIMEOUT for iTimeout specifies no timeout.
A value of PIPLATFORM_NOWAIT for iTimeout specifies that
PIPlatform_pollNetFD() should test for activity on fd but return
immediately even if there is none.
On systems where differences between pipes and file descriptors
are transparent, PIPlatform_pollPipeFD() is implemented using
PIPlatform_pollFD(). On other systems PIPlatform_pollPipeFD() may not
be implemented, see below under 'Errors'.
Return Values:
On success PIPlatform_pollPipeFD() returns a value formed by OR'ing
some of the values PIPLATFORM_POLL_READ and PIPLATFORM_POLL_WRITE
together indicating which operations may be performed on
pipe fd without blocking.
If the specified timeout period expires, PIPlatform_pollPipeFD()
returns a value of zero.
Errors:
On failure PIPlatform_pollNetFD() returns a negative value.
More specific error information can be retreived using
PIPlatform_getLastError().
On some systems PIPlatform_pollPipeFD() is not yet implemented, in this
case a value of PIAPI_ERROR will be returned and
PIPlatform_getLastError() will return a value of PIAPI_NOTSUPPORTED.
See Also:
PIPlatform_pollPipeFD(), IPlatform_pollNetFD(), PIPlatform_sleep().
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_pollPipeFD( PIPLATFORM_FD fd, int iFlags,
int iTimeout );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_pollFD
Synopsis:
int PIPlatform_pollFD( PIPLATFORM_FD fd, int iFlags,
int iTimeout )
Description:
Waits for the activity on the specified file descriptor.
The value iFlags is formed by OR'ing together any
combination of the values PIPLATFORM_POLL_READ and PIPLATFORM_POLL_WRITE.
The value piTimeout is a pointer to an integer containing a time to
wait in seconds.
Notes:
A value of PIPLATFORM_NOTIMEOUT for iTimeout specifies no timeout.
A value of PIPLATFORM_NOWAIT for iTimeout specifies that
PIPlatform_pollNetFD() should test for activity on fd but return
immediately even if there is none.
On systems where differences between sockets and file descriptors
are transparent, PIPlatform_pollFD() is implemented using
PIPlatform_pollNetFD(). On other systems PIPlatform_pollFD() may not
be implemented, see below under 'Errors'.
Return Values:
On success PIPlatform_pollFD() returns a value formed by OR'ing
some of the values PIPLATFORM_POLL_READ and PIPLATFORM_POLL_WRITE together
indicating which operations may be performed on file description fd
without blocking.
If the specified timeout period expires, PIPlatform_pollFD() returns
a value of zero.
Errors:
On failure PIPlatform_pollNetFD() returns a negative value.
More specific error information can be retreived using
PIPlatform_getLastError().
On some systems PIPlatform_pollFD() is not yet implemented, in this
case a value of PIAPI_ERROR will be returned and PIPlatform_getLastError()
will return a value of PIAPI_NOTSUPPORTED.
See Also:
PIPlatform_pollNetFD(), PIPlatform_pollPipeFD(), PIPlatform_sleep().
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_pollFD( PIPLATFORM_FD fd, int iFlags,
int iTimeout );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_sleep
Synopsis:
int PIPlatform_sleep( int iMilliseconds )
Description:
Causes the current thread to sleep for at least iMilliseconds
thousandths of a second. The current thread may sleep for longer
than the specified time period. This is particularly true where
user context threads are in use.
Notes:
If user context threads are being used and no other threads are
runnable PIPlatform_sleep() will cause the process to enter a
'tight loop'. This may be expensive on CPU utilization with some
programs.
Return Values:
On success PIPlatform_sleep() returns a value of 0.
Errors:
On failure PIPlatform_sleep() returns a negative value.
PIPlatform_getLastError() returns more specific error information.
See Also:
PIPlatform_pollNetFD(), PIPlatform_pollFD().
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_sleep( int iMilliseconds );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_getLastError
Synopsis:
int PIPlatform_getLastError()
Description:
Returns the last error code for the current thread.
Notes:
Error codes are only set on error. Except where noted they are
not cleared on success.
Return Values:
PIPlatform_getLastError() always returns the last error code.
Errors:
This function does not generate an error.
See Also:
PIPlatform_setLastError(), Errors.
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_getLastError();
/*____________________________________________________________________________*\
*
Name:
PIPlatform_setLastError
Synopsis:
void PIPlatform_setLastError( int iErrorCode )
Description:
Set the error code for this thread. Subsequent calls to
PIPlatform_getLastError() will return this error code.
Notes:
Return Values:
PIPlatform_setLastError() does not return a value.
Errors:
This function does not generate an error.
See Also:
PIPlatform_getLastError(), Errors
\*____________________________________________________________________________*/
PUBLIC_PIAPI void PIPlatform_setLastError( int iErrorCode );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_catchExceptions
Synopsis:
void PIPlatform_catchExceptions( void (*)(void *), void * )
Description:
Not yet documented.
Notes:
Return Values:
Errors:
See Also:
\*____________________________________________________________________________*/
PUBLIC_PIAPI void PIPlatform_catchExceptions(
void (*)(void *), void * );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_beforeUnsafeBlock
Synopsis:
int PIPlatform_beforeUnsafeBlock()
Description:
Protects reentrance into non-thread safe blocks by blocking on a
semaphore.
Notes:
Calls to PIPlatform_beforeUnsafeBlock() must be matched by calls to
PIPlatform_afterUnsafeBlock().
Return Values:
Returns 0 on success.
Errors:
On error a non-zero value is returned, the function
PIPlatform_getLastError() can be used to get more specific error
information.
See Also:
PIPlatform_afterUnsafeBlock
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_beforeUnsafeBlock();
/*____________________________________________________________________________*\
*
Name:
PIPlatform_afterUnsafeBlock
Synopsis:
int PIPlatform_afterUnsafeBlock()
Description:
Ends a block protected by reentrance with PIPlatform_beforeUnsafeBlock().
Notes:
Return Values:
Returns 0 on success.
Errors:
On error a non-zero value is returned, the function
PIPlatform_getLastError() can be used to get more specific error
information.
See Also:
PIPlatform_beforeUnsafeBlock
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_afterUnsafeBlock();
/*____________________________________________________________________________*\
*
Name:
PIPlatform_getCurrentDirectory
Synopsis:
int PIPlatform_getCurrentDirectory( char *pBuffer, int iMaxLen )
Description:
Retrieve the current directory for the process and write it
into the buffer pBuffer up to iMaxLen characters.
The buffer pBuffer may not be null terminated if the length
of the current directory is greater than or equal to iMaxLen.
Notes:
Return Values:
Returns the length of the current directory. Although no more
than iMaxLen characters will be written into pBuffer,
PIPlatform_getCurrentDirectory() may return a length greater
than iMaxLen.
Errors:
On error PIPlatform_getCurrentDirectory() returns 0.
PIPlatform_getLastError() can be used to get more specific error
information.
See Also:
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_getCurrentDirectory( char *pBuffer, int iMaxLen );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_getProcess
Synopsis:
int PIPlatform_getProcess()
Description:
Retrieve the platform specific identifier or handle for the current
process.
Notes:
Return Values:
Idenifier or handle of Current process.
Errors:
PIPlatform_getProcess() does not generate errors.
See Also:
PIPlatform_getProcessId().
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_getProcess();
/*____________________________________________________________________________*\
*
Name:
PIPlatform_getProcessId
Synopsis:
int PIPlatform_getProcessId()
Description:
Retrieve the platform specific identifier for the current
process.
Notes:
PIPlatform_getProcessId() differs from PIPlatform_getProcess() in that
PIPlatform_getProcessId() always returns an integer process index that
can be used to reference a specific process across all processes.
PIPlatform_getProcess() returns the native reference to a process and
may only be valid within the process space of the current process.
Return Values:
Identifier for the Current process.
Errors:
PIPlatform_getProcessId() does not generate errors.
See Also:
PIPlatform_getProcess().
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_getProcessId();
/*____________________________________________________________________________*\
*
Name:
PIPlatform_waitForProcess
Synopsis:
int PIPlatform_waitForProcess( int tProcess, int iFlags, int
iTimeout )
Description:
Cause the current thread to sleep until the process specified by the
operating system specific identifier or handle (tProcess) has
terminated. iFlags is reserved for future use and should always be 0.
iTimeout specifies the maximum time to wait, measured in seconds.
Notes:
The parameter iFlags must be passed the value 0.
Return Values:
Returns PIAPI_COMPLETED on success, PIAPI_TIMEOUT on timeout,
otherwise PIAPI_ERROR.
Errors:
On error PIAPI_ERROR is returned. The function PIPlatform_getLastError()
can be used to retreive more specific error information.
See Also:
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_waitForProcess( int tProcess, int iFlags,
int iTimeout );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_advisaryLockFd
Synopsis:
PIPlatform_advisaryLockFd( PIPLATFORM_FD tFD )
Description:
Place an advisary lock on a file descriptor, blocking until the
the lock can be obtained. The blocking is performed in an
efficient manner for the process and thread model beng used.
Notes:
Return Values:
On success PIPlatform_advisaryLockFd() returns zero (PIAPI_COMPLETED).
Errors:
On error, the function PIPlatform_getLastError() can be used to get
more specific error information.
See Also:
PIPlatform_advisaryUnlockFd()
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_advisaryLockFd( PIPLATFORM_FD tFD );
/*____________________________________________________________________________*\
*
Name:
PIPlatform_advisaryUnlockFd
Synopsis:
PIPlatform_advisaryUnlockFd( PIPLATFORM_FD tFD )
Description:
Release an advisary lock from a file descriptor, previously placed
with PIPlatform_advisaryLockFd().
Notes:
Return Values:
On success PIPlatform_advisaryUnlockFd() returns zero (PIAPI_COMPLETED).
Errors:
On error, the function PIPlatform_getLastError() can be used to get
more specific error information.
See Also:
PIPlatform_advisaryLockFd()
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIPlatform_advisaryUnlockFd( PIPLATFORM_FD tFD );
#endif /* PIPLAT_H_ */