mutex_init

Initializes a mutex.

Library:LibC

Classification:UNIX International

Service:Synchronization

Syntax

  #include <synch.h>
   
  int   mutex_init (
     mutex_t   *mp,
     int        type,
     void      *arg );

mp

(IN) Points to the mutex to be initialized.

type

(IN) Specifies the type of mutex with one of the following flags:

Flag	Value	Description
USYNC_THREAD	0	The mutex is known only to the owning process.
USYNC_PROCESS	1	Unsupported. The mutex can be shared between processes.

arg

(IN) Reserved for future use. Set to NULL

If successful, returns zero; otherwise, returns a nonzero error code:

Decimal	Constant	Description
79	ENOTSUP	The type parameter contains an invalid value.

UI mutexes cannot be recursive.