//============================================================ // // sdlos_*.c - OS specific low level code // // Copyright (c) 1996-2010, Nicola Salmoria and the MAME Team. // Visit http://mamedev.org for licensing and usage restrictions. // // SDLMAME by Olivier Galibert and R. Belmont // //============================================================ #include #include #include #include #include #include #include // MAME headers #include "osdcore.h" //============================================================ // osd_cycles //============================================================ osd_ticks_t osd_ticks(void) { struct timeval tp; static osd_ticks_t start_sec = 0; gettimeofday(&tp, NULL); if (start_sec==0) start_sec = tp.tv_sec; return (tp.tv_sec - start_sec) * (osd_ticks_t) 1000000 + tp.tv_usec; } osd_ticks_t osd_ticks_per_second(void) { return (osd_ticks_t) 1000000; } //============================================================ // osd_sleep //============================================================ void osd_sleep(osd_ticks_t duration) { UINT32 msec; // convert to milliseconds, rounding down msec = (UINT32)(duration * 1000 / osd_ticks_per_second()); // only sleep if at least 2 full milliseconds if (msec >= 2) { // take a couple of msecs off the top for good measure msec -= 2; usleep(msec*1000); } } //============================================================ // osd_num_processors //============================================================ int osd_num_processors(void) { int processors = 1; #if defined(_SC_NPROCESSORS_ONLN) processors = sysconf(_SC_NPROCESSORS_ONLN); #endif return processors; } //============================================================ // osd_malloc //============================================================ void *osd_malloc(size_t size) { #ifndef MALLOC_DEBUG return malloc(size); #else #error "MALLOC_DEBUG not yet supported" #endif } //============================================================ // osd_free //============================================================ void osd_free(void *ptr) { #ifndef MALLOC_DEBUG free(ptr); #else #error "MALLOC_DEBUG not yet supported" #endif } //============================================================ // osd_alloc_executable // // allocates "size" bytes of executable memory. this must take // things like NX support into account. //============================================================ void *osd_alloc_executable(size_t size) { #if defined(SDLMAME_BSD) return (void *)mmap(0, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, -1, 0); #elif defined(SDLMAME_UNIX) return (void *)mmap(0, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, 0, 0); #endif } //============================================================ // osd_free_executable // // frees memory allocated with osd_alloc_executable //============================================================ void osd_free_executable(void *ptr, size_t size) { munmap(ptr, size); } //============================================================ // osd_break_into_debugger //============================================================ void osd_break_into_debugger(const char *message) { #ifdef MAME_DEBUG printf("MAME exception: %s\n", message); printf("Attempting to fall into debugger\n"); kill(getpid(), SIGTRAP); #else printf("Ignoring MAME exception: %s\n", message); #endif }