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https://github.com/id-Software/DOOM-3.git
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hello world
This commit is contained in:
Timothee 'TTimo' Besset
292
neo/sys/posix/posix_threads.cpp
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292
neo/sys/posix/posix_threads.cpp
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/*
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===========================================================================
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Doom 3 GPL Source Code
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Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).
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Doom 3 Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <stdio.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <pwd.h>
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#include <pthread.h>
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#include "../../idlib/precompiled.h"
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#include "posix_public.h"
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#if defined(_DEBUG)
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// #define ID_VERBOSE_PTHREADS
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#endif
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/*
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======================================================
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locks
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======================================================
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*/
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// we use an extra lock for the local stuff
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const int MAX_LOCAL_CRITICAL_SECTIONS = MAX_CRITICAL_SECTIONS + 1;
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static pthread_mutex_t global_lock[ MAX_LOCAL_CRITICAL_SECTIONS ];
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/*
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==================
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Sys_EnterCriticalSection
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==================
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*/
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void Sys_EnterCriticalSection( int index ) {
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assert( index >= 0 && index < MAX_LOCAL_CRITICAL_SECTIONS );
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#ifdef ID_VERBOSE_PTHREADS
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if ( pthread_mutex_trylock( &global_lock[index] ) == EBUSY ) {
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Sys_Printf( "busy lock %d in thread '%s'\n", index, Sys_GetThreadName() );
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if ( pthread_mutex_lock( &global_lock[index] ) == EDEADLK ) {
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Sys_Printf( "FATAL: DEADLOCK %d, in thread '%s'\n", index, Sys_GetThreadName() );
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}
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}
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#else
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pthread_mutex_lock( &global_lock[index] );
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#endif
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}
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/*
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==================
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Sys_LeaveCriticalSection
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==================
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*/
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void Sys_LeaveCriticalSection( int index ) {
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assert( index >= 0 && index < MAX_LOCAL_CRITICAL_SECTIONS );
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#ifdef ID_VERBOSE_PTHREADS
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if ( pthread_mutex_unlock( &global_lock[index] ) == EPERM ) {
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Sys_Printf( "FATAL: NOT LOCKED %d, in thread '%s'\n", index, Sys_GetThreadName() );
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}
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#else
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pthread_mutex_unlock( &global_lock[index] );
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#endif
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}
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/*
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======================================================
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wait and trigger events
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we use a single lock to manipulate the conditions, MAX_LOCAL_CRITICAL_SECTIONS-1
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the semantics match the win32 version. signals raised while no one is waiting stay raised until a wait happens (which then does a simple pass-through)
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NOTE: we use the same mutex for all the events. I don't think this would become much of a problem
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cond_wait unlocks atomically with setting the wait condition, and locks it back before exiting the function
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the potential for time wasting lock waits is very low
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======================================================
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*/
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pthread_cond_t event_cond[ MAX_TRIGGER_EVENTS ];
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bool signaled[ MAX_TRIGGER_EVENTS ];
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bool waiting[ MAX_TRIGGER_EVENTS ];
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/*
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==================
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Sys_WaitForEvent
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==================
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*/
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void Sys_WaitForEvent( int index ) {
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assert( index >= 0 && index < MAX_TRIGGER_EVENTS );
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Sys_EnterCriticalSection( MAX_LOCAL_CRITICAL_SECTIONS - 1 );
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assert( !waiting[ index ] ); // WaitForEvent from multiple threads? that wouldn't be good
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if ( signaled[ index ] ) {
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// emulate windows behaviour: signal has been raised already. clear and keep going
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signaled[ index ] = false;
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} else {
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waiting[ index ] = true;
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pthread_cond_wait( &event_cond[ index ], &global_lock[ MAX_LOCAL_CRITICAL_SECTIONS - 1 ] );
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waiting[ index ] = false;
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}
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Sys_LeaveCriticalSection( MAX_LOCAL_CRITICAL_SECTIONS - 1 );
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}
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/*
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==================
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Sys_TriggerEvent
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==================
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*/
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void Sys_TriggerEvent( int index ) {
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assert( index >= 0 && index < MAX_TRIGGER_EVENTS );
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Sys_EnterCriticalSection( MAX_LOCAL_CRITICAL_SECTIONS - 1 );
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if ( waiting[ index ] ) {
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pthread_cond_signal( &event_cond[ index ] );
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} else {
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// emulate windows behaviour: if no thread is waiting, leave the signal on so next wait keeps going
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signaled[ index ] = true;
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}
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Sys_LeaveCriticalSection( MAX_LOCAL_CRITICAL_SECTIONS - 1 );
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}
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/*
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======================================================
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thread create and destroy
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======================================================
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*/
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// not a hard limit, just what we keep track of for debugging
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#define MAX_THREADS 10
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xthreadInfo *g_threads[MAX_THREADS];
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int g_thread_count = 0;
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typedef void *(*pthread_function_t) (void *);
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/*
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==================
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Sys_CreateThread
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==================
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*/
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void Sys_CreateThread( xthread_t function, void *parms, xthreadPriority priority, xthreadInfo& info, const char *name, xthreadInfo **threads, int *thread_count ) {
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Sys_EnterCriticalSection( );
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pthread_attr_t attr;
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pthread_attr_init( &attr );
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if ( pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE ) != 0 ) {
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common->Error( "ERROR: pthread_attr_setdetachstate %s failed\n", name );
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}
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if ( pthread_create( ( pthread_t* )&info.threadHandle, &attr, ( pthread_function_t )function, parms ) != 0 ) {
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common->Error( "ERROR: pthread_create %s failed\n", name );
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}
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pthread_attr_destroy( &attr );
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info.name = name;
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if ( *thread_count < MAX_THREADS ) {
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threads[ ( *thread_count )++ ] = &info;
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} else {
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common->DPrintf( "WARNING: MAX_THREADS reached\n" );
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}
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Sys_LeaveCriticalSection( );
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}
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/*
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==================
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Sys_DestroyThread
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==================
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*/
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void Sys_DestroyThread( xthreadInfo& info ) {
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// the target thread must have a cancelation point, otherwise pthread_cancel is useless
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assert( info.threadHandle );
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if ( pthread_cancel( ( pthread_t )info.threadHandle ) != 0 ) {
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common->Error( "ERROR: pthread_cancel %s failed\n", info.name );
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}
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if ( pthread_join( ( pthread_t )info.threadHandle, NULL ) != 0 ) {
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common->Error( "ERROR: pthread_join %s failed\n", info.name );
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}
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info.threadHandle = 0;
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Sys_EnterCriticalSection( );
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for( int i = 0 ; i < g_thread_count ; i++ ) {
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if ( &info == g_threads[ i ] ) {
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g_threads[ i ] = NULL;
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int j;
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for( j = i+1 ; j < g_thread_count ; j++ ) {
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g_threads[ j-1 ] = g_threads[ j ];
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}
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g_threads[ j-1 ] = NULL;
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g_thread_count--;
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Sys_LeaveCriticalSection( );
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return;
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}
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}
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Sys_LeaveCriticalSection( );
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}
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/*
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==================
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Sys_GetThreadName
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find the name of the calling thread
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==================
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*/
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const char* Sys_GetThreadName( int *index ) {
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Sys_EnterCriticalSection( );
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pthread_t thread = pthread_self();
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for( int i = 0 ; i < g_thread_count ; i++ ) {
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if ( thread == (pthread_t)g_threads[ i ]->threadHandle ) {
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if ( index ) {
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*index = i;
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}
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Sys_LeaveCriticalSection( );
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return g_threads[ i ]->name;
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}
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}
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if ( index ) {
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*index = -1;
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}
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Sys_LeaveCriticalSection( );
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return "main";
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}
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/*
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=========================================================
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Async Thread
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=========================================================
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*/
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xthreadInfo asyncThread;
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/*
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=================
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Posix_StartAsyncThread
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=================
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*/
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void Posix_StartAsyncThread() {
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if ( asyncThread.threadHandle == 0 ) {
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Sys_CreateThread( (xthread_t)Sys_AsyncThread, NULL, THREAD_NORMAL, asyncThread, "Async", g_threads, &g_thread_count );
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} else {
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common->Printf( "Async thread already running\n" );
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}
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common->Printf( "Async thread started\n" );
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}
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/*
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==================
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Posix_InitPThreads
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==================
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*/
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void Posix_InitPThreads( ) {
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int i;
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pthread_mutexattr_t attr;
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// init critical sections
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for ( i = 0; i < MAX_LOCAL_CRITICAL_SECTIONS; i++ ) {
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pthread_mutexattr_init( &attr );
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pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
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pthread_mutex_init( &global_lock[i], &attr );
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pthread_mutexattr_destroy( &attr );
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}
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// init event sleep/triggers
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for ( i = 0; i < MAX_TRIGGER_EVENTS; i++ ) {
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pthread_cond_init( &event_cond[ i ], NULL );
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signaled[i] = false;
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waiting[i] = false;
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}
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// init threads table
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for ( i = 0; i < MAX_THREADS; i++ ) {
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g_threads[ i ] = NULL;
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}
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}
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