test/testloadso.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 21 Sep 2009 07:32:26 +0000
branchSDL-1.2
changeset 4209 62e86ab81e3c
parent 3893 f1699aecb65d
child 2120 2c835d58faad
permissions -rw-r--r--
Fixed bug #570

SDL_SemWaitTimeout in src/thread/generic/SDL_syssem.c line 179 (SVN trunk):

--sem->count;

should be

if (retval == 0) {
--sem->count;
}

Without this, sem->count will underflow on timeout effectively breaking the
semaphore. It appears that the implementation has been wrong since the initial
revision.
     1 
     2 /* Test program to test dynamic loading with the loadso subsystem. 
     3 */
     4 
     5 #include <stdio.h>
     6 #include <stdlib.h>
     7 
     8 #include "SDL.h"
     9 
    10 typedef int (*fntype)(const char *);
    11 
    12 int main(int argc, char *argv[])
    13 {
    14 	int retval = 0;
    15 	int hello = 0;
    16 	const char *libname = NULL;
    17 	const char *symname = NULL;
    18 	void *lib = NULL;
    19 	fntype fn = NULL;
    20 
    21 	if (argc != 3) {
    22 		const char *app = argv[0];
    23 		fprintf(stderr, "USAGE: %s <library> <functionname>\n", app);
    24 		fprintf(stderr, "       %s --hello <lib with puts()>\n", app);
    25 		return 1;
    26 	}
    27 
    28 	/* Initialize SDL */
    29 	if ( SDL_Init(0) < 0 ) {
    30 		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
    31 		return 2;
    32 	}
    33 
    34 	if (strcmp(argv[1], "--hello") == 0) {
    35 		hello = 1;
    36 		libname = argv[2];
    37 		symname = "puts";
    38 	} else {
    39 		libname = argv[1];
    40 		symname = argv[2];
    41 	}
    42 
    43 	lib = SDL_LoadObject(libname);
    44         if (lib == NULL) {
    45 		fprintf(stderr, "SDL_LoadObject('%s') failed: %s\n",
    46 		        libname, SDL_GetError());
    47 		retval = 3;
    48 	} else {
    49 		fn = (fntype) SDL_LoadFunction(lib, symname);
    50 		if (fn == NULL) {
    51 			fprintf(stderr, "SDL_LoadFunction('%s') failed: %s\n",
    52 			        symname, SDL_GetError());
    53 			retval = 4;
    54 		} else {
    55 			printf("Found %s in %s at %p\n", symname, libname, fn);
    56 			if (hello) {
    57 				printf("Calling function...\n");
    58 				fflush(stdout);
    59 				fn("     HELLO, WORLD!\n");
    60 				printf("...apparently, we survived.  :)\n");
    61 				printf("Unloading library...\n");
    62 				fflush(stdout);
    63 			}
    64 		}
    65 		SDL_UnloadObject(lib);
    66 	}
    67 	SDL_Quit();
    68 	return(0);
    69 }
    70 
    71