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/*
** ZABBIX
** Copyright (C) 2000-2005 SIA Zabbix
**
** This program 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.
**
** This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
**/
#include "common.h"
#include "threads.h"
#include "log.h"
/******************************************************************************
* *
* Function: zbx_fork *
* *
* Purpose: Flush stdout and stderr before forking *
* *
* Parameters: *
* *
* Return value: same as system fork function *
* *
* Author: Eugene Grigorjev *
* *
* Comments: *
* Use this function instead of system fork function! *
* *
******************************************************************************/
#if !defined(_WINDOWS)
int zbx_fork()
{
fflush(stdout);
fflush(stderr);
return fork();
}
#endif
/******************************************************************************
* *
* Function: zbx_thread_start *
* *
* Purpose: Start the handled function as "thread" *
* *
* Parameters: "thread" handle *
* *
* Return value: returns a handle to the newly created "thread", *
* ZBX_THREAD_ERROR on an error *
* *
* Author: Eugene Grigorjev *
* *
* Comments: *
* The zbx_tread_exit must be called from the handler! *
* *
******************************************************************************/
ZBX_THREAD_HANDLE zbx_thread_start(ZBX_THREAD_ENTRY_POINTER(handler), void *args)
{
ZBX_THREAD_HANDLE thread = 0;
#if defined(_WINDOWS)
unsigned thrdaddr;
if(0 == (thread = (ZBX_THREAD_HANDLE)_beginthreadex(NULL,0,handler,args,0,&thrdaddr))) /* NOTE: _beginthreadex returns 0 on failure, rather than –1 */
{
zbx_error("Error on thread creation. [%s]", strerror_from_system(GetLastError()));
thread = (ZBX_THREAD_HANDLE)(ZBX_THREAD_ERROR);
}
#else /* not _WINDOWS */
thread = zbx_fork();
if(thread == 0) /* child process */
{
(*handler)(args);
/* The zbx_tread_exit must be called from the handler */
/* And in normal case the program will never reach this point. */
zbx_tread_exit(0);
/* Program will never reach this point. */
}
else if(thread < 0)
{
zbx_error("Error on thread creation.");
thread = (ZBX_THREAD_HANDLE)(ZBX_THREAD_ERROR);
}
#endif /* _WINDOWS */
return (ZBX_THREAD_HANDLE)(thread);
}
/******************************************************************************
* *
* Function: zbx_thread_wait *
* *
* Purpose: Waits until the "thread" is in the signaled state *
* *
* Parameters: "thread" handle *
* *
* Return value: process or thread exit code *
* *
* Author: Eugene Grigorjev *
* *
* Comments: *
* *
******************************************************************************/
int zbx_thread_wait(ZBX_THREAD_HANDLE thread)
{
int status = 0; /* significant 8 bits of the status */
#if defined(_WINDOWS)
if(WaitForSingleObject(thread, INFINITE) != WAIT_OBJECT_0)
{
zbx_error("Error on thread waiting. [%s]", strerror_from_system(GetLastError()));
return ZBX_THREAD_ERROR;
}
if( 0 == GetExitCodeThread(thread, &status) )
{
zbx_error("Error on thread exit code receaving. [%s]", strerror_from_system(GetLastError()));
return ZBX_THREAD_ERROR;
}
if(CloseHandle(thread) == 0)
{
zbx_error("Error on thread closing. [%s]", strerror_from_system(GetLastError()));
return ZBX_THREAD_ERROR;
}
#else /* not _WINDOWS */
if(waitpid(thread, &status, 0) <= 0)
{
zbx_error("Error on thread waiting.");
return ZBX_THREAD_ERROR;
}
status = WEXITSTATUS(status);
#endif /* _WINDOWS */
return status;
}
long int zbx_get_thread_id(void)
{
#if defined(_WINDOWS)
return (long int) GetCurrentThreadId();
#else /* not _WINDOWS */
return (long int) getpid();
#endif /* _WINDOWS */
}
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