Added an API to get the amount of system RAM

This commit is contained in:
Sam Lantinga 2013-10-17 11:32:56 -07:00
parent 01164655c0
commit 8b79cbadef
2 changed files with 60 additions and 0 deletions

View File

@ -134,6 +134,11 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE41(void);
*/
extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE42(void);
/**
* This function returns the amount of RAM configured in the system, in MB.
*/
extern DECLSPEC int SDLCALL SDL_GetSystemRAM(void);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus

View File

@ -607,6 +607,60 @@ SDL_HasSSE42(void)
return SDL_FALSE;
}
static int SDL_SystemRAM = 0;
int
SDL_GetSystemRAM(void)
{
if (!SDL_SystemRAM) {
#if defined(HAVE_SYSCONF) && defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
if (SDL_SystemRAM <= 0) {
SDL_SystemRAM = (int)((Sint64)sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE) / (1024*1024));
}
#endif
#ifdef HAVE_SYSCTLBYNAME
if (SDL_SystemRAM <= 0) {
int mib[2] = {CTL_HW, HW_MEMSIZE};
uint64 memsize = 0;
size_t len = sizeof(memsize);
if (sysctl(mib, 2, &memsize, &len, NULL, 0) == 0) {
SDL_SystemRAM = (int)(memsize / (1024*1024));
}
}
#endif
#ifdef __WIN32__
if (SDL_SystemRAM <= 0) {
MEMORYSTATUSEX stat;
if (GlobalMemoryStatusEx(&stat)) {
SDL_SystemRAM = (int)(stat.ullTotalPhys / (1024 * 1024));
}
}
#endif
#if 0 //def __LINUX__
FILE *fpMemInfo = fopen("/proc/meminfo", "r");
if (fpMemInfo) {
char line[1024];
const char *search = "MemTotal:";
const size_t searchlen = SDL_strlen(search);
while (fgets(line, sizeof(line), fpMemInfo)) {
if (SDL_strncasecmp(search, line, searchlen) == 0) {
char *val = line+searchlen;
while (SDL_isspace(*val)) {
++val;
}
SDL_SystemRAM = SDL_atoi(val) / 1024; /* convert from kB to MB */
break;
}
}
fclose(fpMemInfo);
}
#endif
}
return SDL_SystemRAM;
}
#ifdef TEST_MAIN
#include <stdio.h>
@ -627,6 +681,7 @@ main()
printf("SSE3: %d\n", SDL_HasSSE3());
printf("SSE4.1: %d\n", SDL_HasSSE41());
printf("SSE4.2: %d\n", SDL_HasSSE42());
printf("RAM: %d MB\n", SDL_GetSystemRAM());
return 0;
}