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Create a block of shared memory
void *PgShmemCreate( unsigned long size,
char const *name );
ph
This function creates a block of shared memory. The
size argument determines the size of
the block.
If you pass name as NULL, this function
generates a unique name in the form Pg########; this is
the preferred mode of operation. If you pass a name, make sure that it
isn't already in use.
|
You must use the “mx” form of a draw function to pass the
shared memory reference. Otherwise, the data is copied into the
draw event. |
The Photon library uses
atexit()
to arrange for
PgShmemCleanup()
to be called when your program
terminates normally. If your program terminates abnormally,
it should call PgShmemCleanup() explicitly.
A local pointer to shared memory. If an error occurs, it returns
NULL and sets errno.
See the errors for
shm_open()
in the QNX Neutrino Library Reference.
Photon
Safety: | |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
PgDrawBitmapmx(),
PgDrawImagemx(),
PgShmemAttach(),
PgShmemCleanup(),
PgShmemDestroy(),
PgShmemDetach()
shm_open()
in the QNX Neutrino Library Reference
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