threadstate: remove the thread state object

We now have no "big single object" that contains thread state.

src/libgit2/libgit2.c

@@ -26,7 +26,6 @@
 #include "runtime.h"
 #include "sysdir.h"
 #include "thread.h"
-#include "threadstate.h"
 #include "git2/global.h"
 #include "streams/registry.h"
 #include "streams/mbedtls.h"
@@ -74,7 +73,6 @@ int git_libgit2_init(void)
 #endif
 		git_allocator_global_init,
 		git_error_global_init,
-		git_threadstate_global_init,
 		git_threads_global_init,
 		git_oid_global_init,
 		git_rand_global_init,

src/libgit2/threadstate.c

-/*
- * Copyright (C) the libgit2 contributors. All rights reserved.
- *
- * This file is part of libgit2, distributed under the GNU GPL v2 with
- * a Linking Exception. For full terms see the included COPYING file.
- */
-
-#include "threadstate.h"
-#include "runtime.h"
-
-/**
- * Handle the thread-local state
- *
- * `git_threadstate_global_init` will be called as part
- * of `git_libgit2_init` (which itself must be called
- * before calling any other function in the library).
- *
- * This function allocates a TLS index to store the per-
- * thread state.
- *
- * Any internal method that requires thread-local state
- * will then call `git_threadstate_get()` which returns a
- * pointer to the thread-local state structure; this
- * structure is lazily allocated on each thread.
- *
- * This mechanism will register a shutdown handler
- * (`git_threadstate_global_shutdown`) which will free the
- * TLS index.  This shutdown handler will be called by
- * `git_libgit2_shutdown`.
- */
-
-static git_tlsdata_key tls_key;
-
-static void threadstate_dispose(git_threadstate *threadstate)
-{
-	if (!threadstate)
-		return;
-}
-
-static void GIT_SYSTEM_CALL threadstate_free(void *threadstate)
-{
-	threadstate_dispose(threadstate);
-	git__free(threadstate);
-}
-
-static void git_threadstate_global_shutdown(void)
-{
-	git_threadstate *threadstate;
-
-	threadstate = git_tlsdata_get(tls_key);
-	git_tlsdata_set(tls_key, NULL);
-
-	threadstate_dispose(threadstate);
-	git__free(threadstate);
-
-	git_tlsdata_dispose(tls_key);
-}
-
-int git_threadstate_global_init(void)
-{
-	if (git_tlsdata_init(&tls_key, &threadstate_free) != 0)
-		return -1;
-
-	return git_runtime_shutdown_register(git_threadstate_global_shutdown);
-}
-
-git_threadstate *git_threadstate_get(void)
-{
-	git_threadstate *threadstate;
-
-	if ((threadstate = git_tlsdata_get(tls_key)) != NULL)
-		return threadstate;
-
-	/*
-	 * Avoid git__malloc here, since if it fails, it sets an error
-	 * message, which requires thread state, which would allocate
-	 * here, which would fail, which would set an error message...
-	 */
-
-	if ((threadstate = git__allocator.gmalloc(sizeof(git_threadstate),
-			__FILE__, __LINE__)) == NULL)
-		return NULL;
-
-	memset(threadstate, 0, sizeof(git_threadstate));
-
-	git_tlsdata_set(tls_key, threadstate);
-	return threadstate;
-}

src/libgit2/threadstate.h

-/*
- * Copyright (C) the libgit2 contributors. All rights reserved.
- *
- * This file is part of libgit2, distributed under the GNU GPL v2 with
- * a Linking Exception. For full terms see the included COPYING file.
- */
-#ifndef INCLUDE_threadstate_h__
-#define INCLUDE_threadstate_h__
-
-#include "common.h"
-
-typedef struct {
-	char oid_fmt[GIT_OID_MAX_HEXSIZE+1];
-} git_threadstate;
-
-extern int git_threadstate_global_init(void);
-extern git_threadstate *git_threadstate_get(void);
-
-#endif