get_meminfo

hsysinfo.h

@@ -2,7 +2,9 @@
 #define H_SYS_INFO_H_
 
 #include "hplatform.h"
+#include "hfile.h"
 
+// logic processors number
 inline int get_ncpu() {
 #ifdef __unix__
     return sysconf(_SC_NPROCESSORS_CONF);
@@ -11,6 +13,50 @@ inline int get_ncpu() {
     GetSystemInfo(&si);
     return si.dwNumberOfProcessors;
 #endif
+    return 1;
+}
+
+typedef struct meminfo_s {
+    unsigned int total; // MB
+    unsigned int avail; // MB
+} meminfo_t;
+
+inline int get_meminfo(meminfo_t* mem) {
+#ifdef __linux__
+    // cat /proc/meminfo
+    // MemTotal:       16432348 kB
+    // MemFree:          180704 kB
+    // MemAvailable:   10413256 kB
+    // Buffers:         1499936 kB
+    // Cached:          7066496 kB
+    HFile file;
+    if (file.open("/proc/meminfo", "r") != 0) {
+        return -10;
+    }
+    string line;
+    char name[64];
+    unsigned int num;
+    char unit[8];
+    file.readline(line);
+    sscanf(line.c_str(), "%s %u %s", name, &num, unit);
+    //printf("%s %u %s\n", name, num, unit);
+    mem->total = num >> 10;
+    file.readline(line);
+    file.readline(line);
+    sscanf(line.c_str(), "%s %u %s", name, &num, unit);
+    //printf("%s %u %s\n", name, num, unit);
+    mem->avail = num >> 10;
+    return 0;
+#elif defined(_WIN32)
+    MEMORYSTATUSEX memstat;
+    memset(&memstat, 0, sizeof(memstat));
+    memstat.dwLength = sizeof(memstat);
+    GlobalMemoryStatusEx(&memstat);
+    mem->total = memstat.ullTotalPhys >> 20;
+    mem->avail = memstat.ullAvailPhys >> 20;
+    return 0;
+#endif
+    return -1;
 }
 
 #endif // H_SYS_INFO_H_