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-/******************************************************
-A fast mutex for interprocess synchronization.
-mutex_t can be used only within single process,
-but ip mutex also between processes.
-
-(c) 1995 Innobase Oy
-
-Created 9/30/1995 Heikki Tuuri
-*******************************************************/
-
-#ifndef sync0ipm_h
-#define sync0ipm_h
-
-#include "univ.i"
-#include "os0sync.h"
-#include "sync0sync.h"
-
-typedef struct ip_mutex_hdl_struct ip_mutex_hdl_t;
-typedef struct ip_mutex_struct ip_mutex_t;
-
-/* NOTE! The structure appears here only for the compiler to
-know its size. Do not use its fields directly!
-The structure used in a fast implementation of
-an interprocess mutex. */
-
-struct ip_mutex_struct {
- mutex_t mutex; /* Ordinary mutex struct */
- ulint waiters; /* This field is set to 1 if
- there may be waiters */
-};
-
-/* The performance of the ip mutex in NT depends on how often
-a thread has to suspend itself waiting for the ip mutex
-to become free. The following variable counts system calls
-involved. */
-
-extern ulint ip_mutex_system_call_count;
-
-/**********************************************************************
-Creates, or rather, initializes
-an ip mutex object in a specified shared memory location (which must be
-appropriately aligned). The ip mutex is initialized in the reset state.
-NOTE! Explicit destroying of the ip mutex with ip_mutex_free
-is not recommended
-as the mutex resides in shared memory and we cannot make sure that
-no process is currently accessing it. Therefore just use
-ip_mutex_close to free the operating system event and mutex. */
-
-ulint
-ip_mutex_create(
-/*============*/
- /* out: 0 if succeed */
- ip_mutex_t* ip_mutex, /* in: pointer to shared memory */
- char* name, /* in: name of the ip mutex */
- ip_mutex_hdl_t** handle); /* out, own: handle to the
- created mutex; handle exists
- in the private address space of
- the calling process */
-/**********************************************************************
-NOTE! Using this function is not recommended. See the note
-on ip_mutex_create. Destroys an ip mutex */
-
-void
-ip_mutex_free(
-/*==========*/
- ip_mutex_hdl_t* handle); /* in, own: ip mutex handle */
-/**********************************************************************
-Opens an ip mutex object in a specified shared memory location.
-Explicit closing of the ip mutex with ip_mutex_close is necessary to
-free the operating system event and mutex created, and the handle. */
-
-ulint
-ip_mutex_open(
-/*==========*/
- /* out: 0 if succeed */
- ip_mutex_t* ip_mutex, /* in: pointer to shared memory */
- char* name, /* in: name of the ip mutex */
- ip_mutex_hdl_t** handle); /* out, own: handle to the
- opened mutex */
-/**********************************************************************
-Closes an ip mutex. */
-
-void
-ip_mutex_close(
-/*===========*/
- ip_mutex_hdl_t* handle); /* in, own: ip mutex handle */
-/******************************************************************
-Reserves an ip mutex. */
-UNIV_INLINE
-ulint
-ip_mutex_enter(
-/*===========*/
- /* out: 0 if success,
- SYNC_TIME_EXCEEDED if timeout */
- ip_mutex_hdl_t* ip_mutex_hdl, /* in: pointer to ip mutex handle */
- ulint time); /* in: maximum time to wait, in
- microseconds, or
- SYNC_INFINITE_TIME */
-/******************************************************************
-Releases an ip mutex. */
-UNIV_INLINE
-void
-ip_mutex_exit(
-/*==========*/
- ip_mutex_hdl_t* ip_mutex_hdl); /* in: pointer to ip mutex handle */
-
-
-
-#ifndef UNIV_NONINL
-#include "sync0ipm.ic"
-#endif
-
-#endif