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/*
* Copyright (c) 2009 NLNet Labs. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/**
* Threading and locking.
*
*/
#include "config.h"
#include "locks.h"
#include "log.h"
#include <errno.h>
#include <signal.h> /* sigfillset(), sigprocmask() */
#include <string.h> /* strerror() */
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h> /* gettimeofday() */
#endif
#ifdef HAVE_TIME_H
#include <time.h> /* gettimeofday() */
#endif
static const char* lock_str = "lock";
#if !defined(HAVE_PTHREAD)
#include <sys/wait.h> /* waitpid() */
#include <sys/types.h> /* getpid(), waitpid() */
#include <unistd.h> /* fork(), getpid() */
/**
* No threading available: fork a new process.
* This means no shared data structure, and no locking.
* Only the main thread ever returns. Exits on errors.
* @param thr: the location where to store the thread-id.
* @param func: function body of the thread. Return value of func is lost.
* @param arg: user argument to func.
*/
void
ods_thr_fork_create(ods_thread_type* thr, void* (*func)(void*), void* arg)
{
pid_t pid = fork();
switch (pid) {
case 0: /* child */
*thr = (ods_thread_type)getpid();
(void)(*func)(arg);
exit(0);
case -1: /* error */
ods_fatal_exit("[%s] unable to fork thread: %s", lock_str,
strerror(errno));
default: /* main */
*thr = (ods_thread_type)pid;
}
}
/**
* There is no threading. Wait for a process to terminate.
* Note that ub_thread_t is defined as pid_t.
* @param thread: the process id to wait for.
*/
void ods_thr_fork_wait(ods_thread_type thread)
{
int status = 0;
if (waitpid((pid_t)thread, &status, 0) == -1) {
ods_log_error("[%s] waitpid(%d): %s", lock_str, (int)thread,
strerror(errno));
}
if (status != 0) {
ods_log_warning("[%s] process %d abnormal exit with status %d",
lock_str, (int)thread, status);
}
}
#else /* defined(HAVE_PTHREAD) */
int
ods_thread_create(pthread_t *thr, void *(*func)(void *), void *arg)
{
int ret, attr_set;
pthread_attr_t attr;
size_t stacksize;
attr_set = (
!pthread_attr_init(&attr)
&& !pthread_attr_getstacksize(&attr, &stacksize)
&& stacksize < ODS_MINIMUM_STACKSIZE
&& !pthread_attr_setstacksize(&attr, ODS_MINIMUM_STACKSIZE)
);
ret = pthread_create(thr, attr_set?&attr:NULL, func, arg);
if (attr_set)
(void) pthread_attr_destroy(&attr);
if ( ret != 0) {
ods_log_error("%s at %d could not pthread_create(thr, &attr, func, arg): %s",
__FILE__, __LINE__, strerror(ret));
}
return ret;
}
int
ods_thread_wait(cond_basic_type* cond, lock_basic_type* lock, time_t wait)
{
struct timespec ts;
int ret = 0;
#ifndef HAVE_CLOCK_GETTIME
struct timeval tv;
if (gettimeofday(&tv, NULL) != 0) {
ods_log_error("[%s] clock_gettime() error: %s", lock_str,
strerror(errno));
return 1;
}
ts.tv_sec = tv.tv_sec;
ts.tv_nsec = (tv.tv_usec/1000);
#else /* HAVE_CLOCK_GETTIME */
if (clock_gettime(CLOCK_REALTIME, &ts) < 0) {
ods_log_error("[%s] clock_gettime() error: %s", lock_str,
strerror(errno));
return 1;
}
#endif /* !HAVE_CLOCK_GETTIME */
if (wait > 0) {
ts.tv_sec = ts.tv_sec + wait;
ret = pthread_cond_timedwait(cond, lock, &ts);
} else {
ret = pthread_cond_wait(cond, lock);
}
if (ret == ETIMEDOUT) {
return 0;
}
return ret;
}
#endif /* defined(HAVE_PTHREAD) */
void
ods_thread_blocksigs(void)
{
#ifndef HAVE_PTHREAD
int err = 0;
#endif
sigset_t sigset;
sigfillset(&sigset);
#ifndef HAVE_PTHREAD
if((err=pthread_sigmask(SIG_SETMASK, &sigset, NULL)))
ods_fatal_exit("[%s] pthread_sigmask: %s", lock_str, strerror(err));
#else /* !HAVE_PTHREAD */
/* have nothing, do single process signal mask */
if(sigprocmask(SIG_SETMASK, &sigset, NULL) != 0)
ods_fatal_exit("[%s] sigprocmask: %s", lock_str, strerror(errno));
#endif /* HAVE_PTHREAD */
}
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