test/testlock.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 26 Sep 2009 23:17:08 +0000
branchSDL-1.2
changeset 4246 8b8314cc34a6
parent 1769 290b5baf2fca
child 1662 782fd950bd46
child 1895 c121d94672cb
permissions -rw-r--r--
Fixed bug #810

Lauri Kenttä 2009-09-26 06:42:23 PDT

Support for disabling stdio redirect with environment variables.
     1 
     2 /* Test the thread and mutex locking functions 
     3    Also exercises the system's signal/thread interaction
     4 */
     5 
     6 #include <signal.h>
     7 #include <stdio.h>
     8 
     9 #include "SDL.h"
    10 #include "SDL_mutex.h"
    11 #include "SDL_thread.h"
    12 
    13 static SDL_mutex *mutex = NULL;
    14 static Uint32 mainthread;
    15 static SDL_Thread *threads[6];
    16 static volatile int doterminate = 0;
    17 
    18 /*
    19  * SDL_Quit() shouldn't be used with atexit() directly because
    20  *  calling conventions may differ...
    21  */
    22 static void SDL_Quit_Wrapper(void)
    23 {
    24 	SDL_Quit();
    25 }
    26 
    27 void printid(void)
    28 {
    29 	printf("Process %u:  exiting\n", SDL_ThreadID());
    30 }
    31 	
    32 void terminate(int sig)
    33 {
    34 	signal(SIGINT, terminate);
    35 	doterminate = 1;
    36 }
    37 void closemutex(int sig)
    38 {
    39 	Uint32 id = SDL_ThreadID();
    40 	int i;
    41 	printf("Process %u:  Cleaning up...\n", id == mainthread ? 0 : id);
    42 	for ( i=0; i<6; ++i )
    43 		SDL_KillThread(threads[i]);
    44 	SDL_DestroyMutex(mutex);
    45 	exit(sig);
    46 }
    47 int SDLCALL Run(void *data)
    48 {
    49 	if ( SDL_ThreadID() == mainthread )
    50 		signal(SIGTERM, closemutex);
    51 	while ( 1 ) {
    52 		printf("Process %u ready to work\n", SDL_ThreadID());
    53 		if ( SDL_mutexP(mutex) < 0 ) {
    54 			fprintf(stderr, "Couldn't lock mutex: %s", SDL_GetError());
    55 			exit(1);
    56 		}
    57 		printf("Process %u, working!\n", SDL_ThreadID());
    58 		SDL_Delay(1*1000);
    59 		printf("Process %u, done!\n", SDL_ThreadID());
    60 		if ( SDL_mutexV(mutex) < 0 ) {
    61 			fprintf(stderr, "Couldn't unlock mutex: %s", SDL_GetError());
    62 			exit(1);
    63 		}
    64 		/* If this sleep isn't done, then threads may starve */
    65 		SDL_Delay(10);
    66 		if (SDL_ThreadID() == mainthread && doterminate) {
    67 			printf("Process %u:  raising SIGTERM\n", SDL_ThreadID());
    68 			raise(SIGTERM);
    69 		}
    70 	}
    71 	return(0);
    72 }
    73 
    74 int main(int argc, char *argv[])
    75 {
    76 	int i;
    77 	int maxproc = 6;
    78 
    79 	/* Load the SDL library */
    80 	if ( SDL_Init(0) < 0 ) {
    81 		fprintf(stderr, "%s\n", SDL_GetError());
    82 		exit(1);
    83 	}
    84 	atexit(SDL_Quit_Wrapper);
    85 
    86 	if ( (mutex=SDL_CreateMutex()) == NULL ) {
    87 		fprintf(stderr, "Couldn't create mutex: %s\n", SDL_GetError());
    88 		exit(1);
    89 	}
    90 
    91 	mainthread = SDL_ThreadID();
    92 	printf("Main thread: %u\n", mainthread);
    93 	atexit(printid);
    94 	for ( i=0; i<maxproc; ++i ) {
    95 		if ( (threads[i]=SDL_CreateThread(Run, NULL)) == NULL )
    96 			fprintf(stderr, "Couldn't create thread!\n");
    97 	}
    98 	signal(SIGINT, terminate);
    99 	Run(NULL);
   100 
   101 	return(0);	/* Never reached */
   102 }