vn/code/vn_thread_context.h

/* date = April 30th 2023 11:35 am */

#ifndef VN_THREAD_CONTEXT_H
#define VN_THREAD_CONTEXT_H

#define per_thread __declspec(thread)

struct thread_context
{
	memory_arena Arenas[2];
};

per_thread thread_context *ThreadLocal_ThreadContext = 0;

inline void SetThreadContext(thread_context *Context)
{
	ThreadLocal_ThreadContext = Context;
}

inline thread_context *GetThreadContext(void)
{
	return(ThreadLocal_ThreadContext);
}

static temporary_memory GetScratch(memory_arena **Conflicts = 0, u64 ConflictCount = 0)
{
	temporary_memory Scratch = {};
	thread_context *Context = GetThreadContext();
	
	for(u64 ArenaIndex = 0;
					ArenaIndex < ArrayCount(Context->Arenas);
					++ArenaIndex)
	{
		b32 FoundConflict = false;
		for(u64 ConflictIndex = 0;
						ConflictIndex < ConflictCount;
						++ConflictIndex)
		{
			memory_arena *Conflict = Conflicts[ConflictIndex];
			if(Conflict == Context->Arenas + ArenaIndex)
			{
				FoundConflict = true;
				break;
			}
		}
		
		if(!FoundConflict)
		{
			Scratch = BeginTemporaryMemory(Context->Arenas + ArenaIndex);
			break;
		}
	}
	
	Assert(Scratch.Arena);
	
	return(Scratch);
}

#define ReleaseScratch(Scratch) EndTemp(Scratch)

#endif //VN_THREAD_CONTEXT_H