RDIC/gui/memory_arena_linux.c

#include <errno.h>
#include <sys/mman.h>


// NOTE(Patrick): The memory here is by default allocated uncommitted.
// This means that we don't lock down 1GB of memory up front, but get
//  allocated pages by the kernel as needed.
int linux_allocate_arena_memory(
	Memory_Arena *arena,
	size_t arena_size)
{
	void *arena_memory = mmap(
		NULL, arena_size,
		PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
	if(arena_memory == (void*)-1) {
		//perror("mmap");
		return errno;
	}
	arena->memory = arena_memory;
	arena->size = arena_size;
	return 0;
}