PATHMac OS 8 Developer Documentation > Operating System Services > Multiprocessing Services >

Adding Multitasking Capability to Applications Using Multiprocessing Services

   

MPCreateSemaphore

Creates a semaphore.

OSStatus MPCreateSemaphore (
                     MPSemaphoreCount maximumValue,
                     MPSemaphoreCount initialValue,
                     MPSemaphoreID *semaphore);
maximumValue
A value of type MPSemaphoreCount that specifies the maximum allowed value of the semaphore.
initialValue
A value of type MPSemaphoreCount that specifies the initial value of the semaphore.
semaphore
A pointer to a variable of type MPSemaphoreID . On return, the variable contains the ID of the newly-created semaphore.
function result
A result code. See Result Codes for a list of possible values.
DISCUSSION

If you want to create a binary semaphore, you can call the macro MPCreateBinarySemaphore (MPSemaphoreID *semaphore) instead, which simply calls MPCreateSemaphore with both maximumValue and initialValue set to 1.

VERSION NOTES

Introduced with Multiprocessing Services 1.0.

SEE ALSO

The function MPDeleteSemaphore .

© 1999 Apple Computer, Inc. – (Last Updated 07 May 99)