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JRUNTIME.Z
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monitor.h
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1998-05-08
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/*
* @(#)monitor.h 1.34 97/10/07
*
* Copyright (c) 1995, 1996 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
* CopyrightVersion 1.1_beta
*
*/
/*
* Monitor interface
*/
#ifndef _MONITOR_H_
#define _MONITOR_H_
#include "sys_api.h"
/*
* Used by the monitor caching machanism to mark monitors as being
* in-use.
*/
#define MON_LOCAL_CACHE_REF (1 << 0)
/*
* The monitor data structure:
*
* The use_count field counts the number of createMonitor calls yet
* unmatched by monitorExit calls; that is, it is a count of outstanding
* monitor entries of all threads regardless of whether those threads
* own the monitor or are waiting on it.
*
* Note that because the mid[] array will hold the system-specific
* sys_mon_t, it needs to start on a four-byte boundary lest the fields
* of the sys_mon_t aren't properly aligned. Otherwise the flags field
* would be shorter than a long.
*/
typedef struct monitor_t {
unsigned int key; /* Monitor hash key */
struct monitor_t *next;
char mid[1]; /* The sys_mon_t */
} monitor_t, *MID;
/* A macro for accessing the sys_mon_t from the monitor_t */
#define sysmon(m) (*(sys_mon_t *) m->mid)
typedef struct reg_mon_t {
sys_mon_t *mid;
char *name;
struct reg_mon_t *next;
} reg_mon_t;
/*
* Macros
*/
#define MID_NULL ((MID) 0)
#define TIMEOUT_INFINITY -1
/*
* Support for the monitor registry
*/
extern sys_mon_t *_registry_lock;
#define REGISTRY_LOCK_INIT() monitorRegister(_registry_lock, \
"Monitor registry")
#define REGISTRY_LOCK() sysMonitorEnter(_registry_lock)
#define REGISTRY_LOCKED() sysMonitorEntered(_registry_lock)
#define REGISTRY_UNLOCK() sysMonitorExit(_registry_lock)
/*
* External routines.
*/
/*
* Synchronization interface
*/
void monitorInit(monitor_t *mon);
void monitorCacheInit(void);
void monitorEnter(unsigned int);
void monitorExit(unsigned int);
void monitorWait(unsigned int, int);
void monitorNotify(unsigned int);
void monitorNotifyAll(unsigned int);
/* Registry of static monitors */
extern reg_mon_t *MonitorRegistry;
void monitorRegistryInit(void);
void monitorRegister(sys_mon_t *, char *);
void monitorUnregister(sys_mon_t *);
void registeredEnumerate(void (*)(reg_mon_t *, void *), void *);
void registeredEnumerate_unlocked(void (*)(reg_mon_t *, void *), void *);
/*
* Random non-local locks without obviously better homes
*/
/* The class loading lock */
extern sys_mon_t *_loadclass_lock;
#define LOADCLASS_LOCK_INIT() \
monitorRegister(_loadclass_lock, "Class loading lock")
#define LOADCLASS_LOCK() sysMonitorEnter(_loadclass_lock)
#define LOADCLASS_LOCKED() sysMonitorEntered(_loadclass_lock)
#define LOADCLASS_UNLOCK() sysMonitorExit(_loadclass_lock)
/* The global class table (binclasses) lock */
extern sys_mon_t *_binclass_lock;
#define BINCLASS_LOCK_INIT() monitorRegister(_binclass_lock, "BinClass lock")
#define BINCLASS_LOCK() sysMonitorEnter(_binclass_lock)
#define BINCLASS_LOCKED() sysMonitorEntered(_binclass_lock)
#define BINCLASS_UNLOCK() sysMonitorExit(_binclass_lock)
/* Locks on the interned string hash table */
extern sys_mon_t *_stringhash_lock;
#define STRINGHASH_INIT() monitorRegister(_stringhash_lock, \
"String intern lock")
#define STRINGHASH_LOCK() sysMonitorEnter(_stringhash_lock)
#define STRINGHASH_LOCKED() sysMonitorEntered(_stringhash_lock)
#define STRINGHASH_UNLOCK() sysMonitorExit(_stringhash_lock)
/* Locks on the method info (name and signature) hash table */
extern sys_mon_t *_nametypehash_lock;
#define NAMETYPEHASH_INIT() monitorRegister(_nametypehash_lock, \
"Name and type hash table lock")
#define NAMETYPEHASH_LOCK() sysMonitorEnter(_nametypehash_lock)
#define NAMETYPEHASH_LOCKED() sysMonitorEntered(_nametypehash_lock)
#define NAMETYPEHASH_UNLOCK() sysMonitorExit(_nametypehash_lock)
/* JNI global reference locks */
extern sys_mon_t *_globalref_lock;
#define GLOBALREF_LOCK_INIT() \
monitorRegister(_globalref_lock, "JNI global reference lock")
#define GLOBALREF_LOCK() sysMonitorEnter(_globalref_lock)
#define GLOBALREF_LOCKED() sysMonitorEntered(_globalref_lock)
#define GLOBALREF_UNLOCK() sysMonitorExit(_globalref_lock)
#endif /* !_MONITOR_H_ */