GEEKING

App/util/Darwin/MemoryStats.cpp

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+#include "MemoryStats.h"
+
+#include <mach/mach.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+// memory functions from stackoverflow.com
+namespace RBX {
+namespace MemoryStats {
+        
+memsize_t usedMemoryBytes()
+{
+	struct task_basic_info info;
+	mach_msg_type_number_t size = sizeof(info);
+	kern_return_t kerr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)&info, &size);
+	return (kerr == KERN_SUCCESS) ? info.resident_size : 0;
+}
+
+memsize_t freeMemoryBytes()
+{
+	mach_port_t host_port = mach_host_self();
+	mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
+	vm_size_t pagesize;
+	vm_statistics_data_t vm_stat;
+	
+	host_page_size(host_port, &pagesize);
+	(void) host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
+	return vm_stat.free_count * pagesize;
+}
+
+memsize_t totalMemoryBytes()
+{
+	// https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/sysctl.3.html
+    int mib[2] = { CTL_HW, HW_MEMSIZE };
+    u_int namelen = sizeof(mib) / sizeof(mib[0]);
+    uint64_t size;
+    size_t len = sizeof(size);
+    
+    if (sysctl(mib, namelen, &size, &len, NULL, 0) >= 0)
+        return size;
+
+    return 0;
+}
+
+} // namespace MemoryStats
+} // namespace RBX