LF MPMC queue improvements

Small improvements of the LF MPMC queue

Making the LF MPMC queue generic and in a seperate header file

arena_base.h

@@ -1,5 +1,4 @@
-#ifndef BASE_H
-#define BASE_H
+#pragma once
 
 #include <assert.h>
 #include <stdbool.h>
@@ -58,4 +57,73 @@ typedef double f64;
 #define ASSERT(x) assert(x)
 #endif
 
-#endif // Base.h
+/* ------------------------------------------------------------
+   Some helper functions
+   ------------------------------------------------------------ */
+
+#if defined(_WIN32) || defined(_WIN64)
+
+#include <Windows.h>
+
+static u32 plat_get_pagesize(void) {
+  SYSTEM_INFO sysinfo = {0};
+  GetSystemInfo(&sysinfo);
+
+  return sysinfo.dwPageSize;
+}
+
+static void *plat_mem_reserve(u64 size) {
+  return VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_READWRITE);
+}
+
+static b32 plat_mem_commit(void *ptr, u64 size) {
+  void *ret = VirtualAlloc(ptr, size, MEM_COMMIT, PAGE_READWRITE);
+  return ret != NULL;
+}
+
+static b32 plat_mem_decommit(void *ptr, u64 size) {
+  return VirtualFree(ptr, size, MEM_DECOMMIT);
+}
+
+static b32 plat_mem_release(void *ptr, u64 size) {
+  return VirtualFree(ptr, size, MEM_RELEASE);
+}
+
+#elif defined(__linux__)
+
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
+#include <sys/mman.h>
+#include <unistd.h>
+
+static u32 plat_get_pagesize(void) { return (u32)sysconf(_SC_PAGESIZE); }
+
+static void *plat_mem_reserve(u64 size) {
+  void *out = mmap(NULL, size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  if (out == MAP_FAILED) {
+    return NULL;
+  }
+  return out;
+}
+
+static b32 plat_mem_commit(void *ptr, u64 size) {
+  i32 ret = mprotect(ptr, size, PROT_READ | PROT_WRITE);
+  return ret == 0;
+}
+
+static b32 plat_mem_decommit(void *ptr, u64 size) {
+  i32 ret = mprotect(ptr, size, PROT_NONE);
+  if (ret != 0)
+    return false;
+  ret = madvise(ptr, size, MADV_DONTNEED);
+  return ret == 0;
+}
+
+static b32 plat_mem_release(void *ptr, u64 size) {
+  i32 ret = munmap(ptr, size);
+  return ret == 0;
+}
+
+#endif