Migration to this repository

test/build.sh

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+gcc -std=c99 -ggdb -Wall -Wextra -fsanitize=address,undefined rdic_test.c

test/memory_arena.c

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+
+
+
+typedef struct Memory_Arena
+{
+	void *memory;
+	size_t size;
+	size_t allocation_offset;
+} Memory_Arena;
+
+_Static_assert(sizeof(size_t) == sizeof(void*),
+	"The Memory_Arena implementation assumes that size_t and pointers are of the same size.");
+
+void *memory_arena_allocate(
+	Memory_Arena *arena,
+	size_t size,
+	size_t alignment)
+{
+	#if 0
+	printf(
+		"%s: arena: {.memory=%p, .size=%zu, .allocation_offset=%zu}\n"
+		"size: %zu, alignment: %zu\n"
+		, __func__
+		, arena->memory, arena->size, arena->allocation_offset
+		, size, alignment
+		);
+	#endif
+	size_t allocation_offset = arena->allocation_offset;
+	allocation_offset = ((allocation_offset + alignment - 1) / alignment) * alignment;
+	if(allocation_offset + size > arena->size)
+	{
+		return NULL;
+	}
+	void *allocation = ((char*)arena->memory) + allocation_offset;
+	arena->allocation_offset = allocation_offset + size;
+	return allocation;
+}
+
+void memory_arena_reset(
+	Memory_Arena *arena)
+{
+	arena->allocation_offset = 0;
+}
+
+
+
+
+
+
+
+

test/memory_arena_linux.c

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+
+#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;
+}
+
+
+
+