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/** BEGIN COPYRIGHT BLOCK
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#ifndef BASE_CRIT_H
#define BASE_CRIT_H
#ifndef NOINTNSAPI
#define INTNSAPI
#endif /* !NOINTNSAPI */
/*
* crit.h: Critical section abstraction. Used in threaded servers to protect
* areas where two threads can interfere with each other.
*
* Condvars are condition variables that are used for thread-thread
* synchronization.
*
* Rob McCool
*/
#ifndef NETSITE_H
#include "netsite.h"
#endif /* !NETSITE_H */
/* Define C++ interface */
#ifdef __cplusplus
#include "prlog.h" /* NSPR */
#ifndef prmon_h___
#include "prmon.h"
#endif /* !prmon_h___ */
class NSAPI_PUBLIC CriticalSection
{
public:
CriticalSection();
~CriticalSection();
void Acquire(){PR_EnterMonitor(_crtsec);}
void Release(){PR_ExitMonitor(_crtsec);}
private:
PRMonitor *_crtsec;
};
inline CriticalSection::CriticalSection():_crtsec(0)
{
_crtsec = PR_NewMonitor();
PR_ASSERT(_crtsec);
}
inline CriticalSection::~CriticalSection()
{
if (_crtsec)
PR_DestroyMonitor(_crtsec);
}
class SafeLock {
public:
SafeLock (CriticalSection&); // acquire lock
~SafeLock (); // release lock
private:
CriticalSection& lock;
};
inline SafeLock::SafeLock (CriticalSection& _lock) : lock(_lock)
{
lock.Acquire();
}
inline SafeLock::~SafeLock ()
{
lock.Release();
}
#endif /* __cplusplus */
/* --- Begin function prototypes --- */
#ifdef INTNSAPI
NSPR_BEGIN_EXTERN_C
/* ASSERT function only */
NSAPI_PUBLIC int crit_owner_is_me(CRITICAL id);
/*
* INTcrit_init creates and returns a new critical section variable. At the
* time of creation no one has entered it.
*/
NSAPI_PUBLIC CRITICAL INTcrit_init(void);
/*
* INTcrit_enter enters a critical section. If someone is already in the
* section, the calling thread is blocked until that thread exits.
*/
NSAPI_PUBLIC void INTcrit_enter(CRITICAL id);
/*
* INTcrit_exit exits a critical section. If another thread is blocked waiting
* to enter, it will be unblocked and given ownership of the section.
*/
NSAPI_PUBLIC void INTcrit_exit(CRITICAL id);
/*
* INTcrit_terminate removes a previously allocated critical section variable.
*/
NSAPI_PUBLIC void INTcrit_terminate(CRITICAL id);
/*
* INTcondvar_init initializes and returns a new condition variable. You
* must provide a critical section to be associated with this condition
* variable.
*/
NSAPI_PUBLIC CONDVAR INTcondvar_init(CRITICAL id);
/*
* INTcondvar_wait blocks on the given condition variable. The calling thread
* will be blocked until another thread calls INTcondvar_notify on this variable.
* The caller must have entered the critical section associated with this
* condition variable prior to waiting for it.
*/
NSAPI_PUBLIC void INTcondvar_wait(CONDVAR cv);
NSAPI_PUBLIC void condvar_timed_wait(CONDVAR _cv, long secs);
/*
* INTcondvar_notify awakens any threads blocked on the given condition
* variable. The caller must have entered the critical section associated
* with this variable first.
*/
NSAPI_PUBLIC void INTcondvar_notify(CONDVAR cv);
/*
* INTcondvar_notifyAll awakens all threads blocked on the given condition
* variable. The caller must have entered the critical section associated
* with this variable first.
*/
NSAPI_PUBLIC void INTcondvar_notifyAll(CONDVAR cv);
/*
* INTcondvar_terminate frees the given previously allocated condition variable
*/
NSAPI_PUBLIC void INTcondvar_terminate(CONDVAR cv);
/*
* Create a counting semaphore.
* Return non-zero on success, 0 on failure.
*/
NSAPI_PUBLIC COUNTING_SEMAPHORE INTcs_init(int initial_count);
/*
* Destroy a counting semaphore
*/
NSAPI_PUBLIC void INTcs_terminate(COUNTING_SEMAPHORE csp);
/*
* Wait to "enter" the semaphore.
* Return 0 on success, -1 on failure.
*/
NSAPI_PUBLIC int INTcs_wait(COUNTING_SEMAPHORE csp);
/*
* Enter the semaphore if the count is > 0. Otherwise return -1.
*
*/
NSAPI_PUBLIC int INTcs_trywait(COUNTING_SEMAPHORE csp);
/*
* Release the semaphore- allowing a thread to enter.
* Return 0 on success, -1 on failure.
*/
NSAPI_PUBLIC int INTcs_release(COUNTING_SEMAPHORE csp);
NSPR_END_EXTERN_C
/* --- End function prototypes --- */
#define crit_init INTcrit_init
#define crit_enter INTcrit_enter
#define crit_exit INTcrit_exit
#define crit_terminate INTcrit_terminate
#define condvar_init INTcondvar_init
#define condvar_wait INTcondvar_wait
#define condvar_notify INTcondvar_notify
#define condvar_notifyAll INTcondvar_notifyAll
#define condvar_terminate INTcondvar_terminate
#define cs_init INTcs_init
#define cs_terminate INTcs_terminate
#define cs_wait INTcs_wait
#define cs_trywait INTcs_trywait
#define cs_release INTcs_release
#endif /* INTNSAPI */
#endif /* !BASE_CRIT_H */
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