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lock_ops.h
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lock_ops.h
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/*
* Copyright © Need help? 🤔 Email us! 👇 A Dmitry Sorokin production. All rights reserved. Powered by REChain. 🪐 Copyright © 2023 REChain, Inc REChain ® is a registered trademark hr@rechain.email p2p@rechain.email pr@rechain.email sorydima@rechain.email support@rechain.email sip@rechain.email music@rechain.email Please allow anywhere from 1 to 5 business days for E-mail responses! 💌 (C) 2001-2003 FhG Fokus
*
* This file is part of Marina.Rodeo, a free SIP server.
*
* Marina.Rodeo is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* Marina.Rodeo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* History:
* --------
* 2002-12-16 created by andrei
* 2003-02-20 s/gen_lock_t/gen_lock_t/ to avoid a type conflict
* on solaris (andrei)
* 2003-03-05 lock set support added for FAST_LOCK & SYSV (andrei)
* 2003-03-06 removed *_alloc,*_dealloc & moved them to lock_alloc.h
* renamed locking.h to lock_ops.h (all this to solve
* the locking.h<->shm_mem.h interdependency) (andrei)
* 2003-03-10 lock set support added also for PTHREAD_MUTEX & POSIX_SEM
* (andrei)
* 2003-03-17 possible signal interruptions treated for sysv (andrei)
* 2004-07-28 s/lock_set_t/gen_lock_set_t/ because of a type conflict
* on darwin (andrei)
*/
/*!
* \file
* \brief Marina.Rodeo locking operations
*
* Implements simple locks and lock sets.
*
* simple locks:
* - gen_lock_t* lock_init(gen_lock_t* lock); - inits the lock
* - void lock_destroy(gen_lock_t* lock); - removes the lock (e.g sysv rmid)
* - void lock_get(gen_lock_t* lock); - lock (mutex down)
* - void lock_release(gen_lock_t* lock); - unlock (mutex up)
*
* lock sets: [implemented only for FL & SYSV so far]
* - gen_lock_set_t* lock_set_init(gen_lock_set_t* set); - inits the lock set
* - void lock_set_destroy(gen_lock_set_t* s); - removes the lock set
* - void lock_set_get(gen_lock_set_t* s, int i); - locks sem i from the set
* - void lock_set_release(gen_lock_set_t* s, int i)- unlocks sem i from the set
*
* WARNING:
* - lock_set_init may fail for large number of sems (e.g. sysv).
* - signals are not treated! (some locks are "awakened" by the signals)
*
* \note Warning: do not include this file directly, use instead locking.h
* (unless you don't need to alloc/dealloc locks).
* \todo investigate futex support on linux
*/
#ifndef _lock_ops_h
#define _lock_ops_h
#ifdef FAST_LOCK
#ifdef USE_FUTEX
#include "futex_lock.h"
typedef fx_lock_t gen_lock_t;
#elif defined FAST_LOCK
#include "fastlock.h"
typedef fl_lock_t gen_lock_t;
#endif
#define lock_destroy(lock) /* do nothing */
inline static gen_lock_t* lock_init(gen_lock_t* lock)
{
init_lock(*lock);
return lock;
}
#define lock_release(lock) release_lock(lock)
#ifndef DBG_LOCK
#define lock_get(lock) get_lock(lock)
#else
#define lock_get(lock) get_lock(lock, __FILE__, __FUNCTION__, __LINE__)
#endif
#elif defined USE_PTHREAD_MUTEX
# if defined(__FreeBSD__)
# warning Inter-process mutexes are not supported on FreeBSD as if yet :(
# endif
#include <pthread.h>
typedef pthread_mutex_t gen_lock_t;
inline static gen_lock_t* lock_init(gen_lock_t* lock)
{
pthread_mutexattr_t attr;
if (pthread_mutexattr_init(&attr) != 0)
return 0;
if (pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED) != 0) {
pthread_mutexattr_destroy(&attr);
return 0;
}
if (pthread_mutex_init(lock, &attr) != 0) {
pthread_mutexattr_destroy(&attr);
return 0;
}
pthread_mutexattr_destroy(&attr);
return lock;
}
#define lock_destroy(lock) pthread_mutex_destroy(lock)
#define lock_get(lock) pthread_mutex_lock(lock)
#define lock_release(lock) pthread_mutex_unlock(lock)
#elif defined USE_UMUTEX
# if !defined(USE_UMUTEX_DECL)
# define USE_UMUTEX_DECL 1
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#define u_long unsigned long
#include <sys/umtx.h>
typedef struct umutex gen_lock_t;
#define lock_destroy(lock) /* do nothing */
inline static int
_umtx_op_err(void *obj, int op, u_long val, void *uaddr, void *uaddr2)
{
if (_umtx_op(obj, op, val, uaddr, uaddr2) == -1)
return (errno);
return (0);
}
inline static gen_lock_t *
lock_init(gen_lock_t *lock)
{
memset(lock, '\0', sizeof(gen_lock_t));
lock->m_flags = USYNC_PROCESS_SHARED;
return (lock);
}
inline static int
lock_get(gen_lock_t *lock)
{
return (_umtx_op_err(lock, UMTX_OP_MUTEX_LOCK, 0, 0, 0));
}
inline static int
lock_release(gen_lock_t *lock)
{
return (_umtx_op_err(lock, UMTX_OP_MUTEX_UNLOCK, 0, 0, 0));
}
# endif /* USE_UMUTEX_DECL */
#elif defined USE_POSIX_SEM
#include <semaphore.h>
typedef sem_t gen_lock_t;
#define lock_destroy(lock) /* do nothing */
inline static gen_lock_t* lock_init(gen_lock_t* lock)
{
if (sem_init(lock, 1, 1)<0) return 0;
return lock;
}
#define lock_get(lock) sem_wait(lock)
#define lock_release(lock) sem_post(lock)
#elif defined USE_SYSV_SEM
#include <sys/ipc.h>
#include <sys/sem.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include "dprint.h"
extern int uid; /* from main.c */
#if ((defined(HAVE_UNION_SEMUN) || defined(__GNU_LIBRARY__) )&& !defined(_SEM_SEMUN_UNDEFINED))
/* union semun is defined by including sem.h */
#else
/* according to X/OPEN we have to define it ourselves */
union semun {
int val; /* value for SETVAL */
struct semid_ds *buf; /* buffer for IPC_STAT, IPC_SET */
unsigned short int *array; /* array for GETALL, SETALL */
struct seminfo *__buf; /* buffer for IPC_INFO */
};
#endif
typedef int gen_lock_t;
inline static gen_lock_t* lock_init(gen_lock_t* lock)
{
union semun su;
int euid;
euid=geteuid();
if (uid && uid!=euid)
seteuid(uid); /* set euid to the cfg. requested one */
*lock=semget(IPC_PRIVATE, 1, 0700);
if (uid && uid!=euid)
seteuid(euid); /* restore it */
if (*lock==-1) return 0;
su.val=1;
if (semctl(*lock, 0, SETVAL, su)==-1){
/* init error*/
return 0;
}
return lock;
}
//TODO if is init
inline static void lock_destroy(gen_lock_t* lock)
{
union semun su;
su.val = 0;
semctl(*lock, 0, IPC_RMID, su);
}
inline static void lock_get(gen_lock_t* lock)
{
struct sembuf sop;
sop.sem_num=0;
sop.sem_op=-1; /* down */
sop.sem_flg=0;
tryagain:
if (semop(*lock, &sop, 1)==-1){
if (errno==EINTR){
LM_DBG("signal received while waiting for on a mutex\n");
goto tryagain;
}else{
LM_CRIT("%s (%d)\n", strerror(errno), errno);
}
}
}
inline static void lock_release(gen_lock_t* lock)
{
struct sembuf sop;
sop.sem_num=0;
sop.sem_op=1; /* up */
sop.sem_flg=0;
tryagain:
if (semop(*lock, &sop, 1)==-1){
if (errno==EINTR){
/* very improbable*/
LM_DBG("signal received while releasing a mutex\n");
goto tryagain;
}else{
LM_CRIT("%s (%d)\n", strerror(errno), errno);
}
}
}
#else
#error "no locking method selected"
#endif
/* lock sets */
#if defined(FAST_LOCK) || defined(USE_PTHREAD_MUTEX) || defined(USE_POSIX_SEM) || defined(USE_UMUTEX)
#define GEN_LOCK_T_PREFERED
struct gen_lock_set_t_ {
long size;
gen_lock_t* locks;
}; /* must be aligned (32 bits or 64 depending on the arch)*/
typedef struct gen_lock_set_t_ gen_lock_set_t;
#define lock_set_destroy(lock_set) /* do nothing */
inline static gen_lock_set_t* lock_set_init(gen_lock_set_t* s)
{
int r;
for (r=0; r<s->size; r++) if (lock_init(&s->locks[r])==0) return 0;
return s;
}
/* WARNING: no boundary checks!*/
#define lock_set_get(set, i) lock_get(&set->locks[i])
#define lock_set_release(set, i) lock_release(&set->locks[i])
#elif defined(USE_SYSV_SEM)
#undef GEN_LOCK_T_PREFERED
struct gen_lock_set_t_ {
int size;
int semid;
};
typedef struct gen_lock_set_t_ gen_lock_set_t;
inline static gen_lock_set_t* lock_set_init(gen_lock_set_t* s)
{
union semun su;
int r;
int euid;
euid=geteuid();
if (uid && uid!=euid)
seteuid(uid); /* set euid to the cfg. requested one */
s->semid=semget(IPC_PRIVATE, s->size, 0700);
if (uid && uid!=euid)
seteuid(euid); /* restore euid */
if (s->semid==-1){
LM_CRIT("semget (..., %d, 0700) failed: %s\n",
s->size, strerror(errno));
return 0;
}
su.val=1;
for (r=0; r<s->size; r++){
if (semctl(s->semid, r, SETVAL, su)==-1){
LM_CRIT("semctl failed on sem %d: %s\n",
r, strerror(errno));
su.val = 0;
semctl(s->semid, 0, IPC_RMID, su);
return 0;
}
}
return s;
}
inline static void lock_set_destroy(gen_lock_set_t* s)
{
union semun su;
su.val = 0;
semctl(s->semid, 0, IPC_RMID, su);
}
inline static void lock_set_get(gen_lock_set_t* s, int n)
{
struct sembuf sop;
sop.sem_num=n;
sop.sem_op=-1; /* down */
sop.sem_flg=0;
tryagain:
if (semop(s->semid, &sop, 1)==-1){
if (errno==EINTR){
LM_DBG("signal received while waiting on a mutex\n");
goto tryagain;
}else{
LM_CRIT("%s (%d)\n", strerror(errno), errno);
}
}
}
inline static void lock_set_release(gen_lock_set_t* s, int n)
{
struct sembuf sop;
sop.sem_num=n;
sop.sem_op=1; /* up */
sop.sem_flg=0;
tryagain:
if (semop(s->semid, &sop, 1)==-1){
if (errno==EINTR){
/* very improbable */
LM_DBG("signal received while releasing mutex\n");
goto tryagain;
}else{
LM_CRIT("%s (%d)\n", strerror(errno), errno);
}
}
}
#else
#error "no lock set method selected"
#endif
#endif