1 files changed, 140 insertions, 0 deletions
diff --git a/src/util/thread.c b/src/util/thread.c
new file mode 100644
index 000000000..bc7364f8c
--- /dev/null
+++ b/src/util/thread.c
@@ -0,0 +1,140 @@
+/*
+ * 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 "git2_util.h"
+
+#if !defined(GIT_THREADS)
+
+#define TLSDATA_MAX 16
+
+typedef struct {
+	void *value;
+	void (GIT_SYSTEM_CALL *destroy_fn)(void *);
+} tlsdata_value;
+
+static tlsdata_value tlsdata_values[TLSDATA_MAX];
+static int tlsdata_cnt = 0;
+
+int git_tlsdata_init(git_tlsdata_key *key, void (GIT_SYSTEM_CALL *destroy_fn)(void *))
+{
+	if (tlsdata_cnt >= TLSDATA_MAX)
+		return -1;
+
+	tlsdata_values[tlsdata_cnt].value = NULL;
+	tlsdata_values[tlsdata_cnt].destroy_fn = destroy_fn;
+
+	*key = tlsdata_cnt;
+	tlsdata_cnt++;
+
+	return 0;
+}
+
+int git_tlsdata_set(git_tlsdata_key key, void *value)
+{
+	if (key < 0 || key > tlsdata_cnt)
+		return -1;
+
+	tlsdata_values[key].value = value;
+	return 0;
+}
+
+void *git_tlsdata_get(git_tlsdata_key key)
+{
+	if (key < 0 || key > tlsdata_cnt)
+		return NULL;
+
+	return tlsdata_values[key].value;
+}
+
+int git_tlsdata_dispose(git_tlsdata_key key)
+{
+	void *value;
+	void (*destroy_fn)(void *) = NULL;
+
+	if (key < 0 || key > tlsdata_cnt)
+		return -1;
+
+	value = tlsdata_values[key].value;
+	destroy_fn = tlsdata_values[key].destroy_fn;
+
+	tlsdata_values[key].value = NULL;
+	tlsdata_values[key].destroy_fn = NULL;
+
+	if (value && destroy_fn)
+		destroy_fn(value);
+
+	return 0;
+}
+
+#elif defined(GIT_WIN32)
+
+int git_tlsdata_init(git_tlsdata_key *key, void (GIT_SYSTEM_CALL *destroy_fn)(void *))
+{
+	DWORD fls_index = FlsAlloc(destroy_fn);
+
+	if (fls_index == FLS_OUT_OF_INDEXES)
+		return -1;
+
+	*key = fls_index;
+	return 0;
+}
+
+int git_tlsdata_set(git_tlsdata_key key, void *value)
+{
+	if (!FlsSetValue(key, value))
+		return -1;
+
+	return 0;
+}
+
+void *git_tlsdata_get(git_tlsdata_key key)
+{
+	return FlsGetValue(key);
+}
+
+int git_tlsdata_dispose(git_tlsdata_key key)
+{
+	if (!FlsFree(key))
+		return -1;
+
+	return 0;
+}
+
+#elif defined(_POSIX_THREADS)
+
+int git_tlsdata_init(git_tlsdata_key *key, void (GIT_SYSTEM_CALL *destroy_fn)(void *))
+{
+	if (pthread_key_create(key, destroy_fn) != 0)
+		return -1;
+
+	return 0;
+}
+
+int git_tlsdata_set(git_tlsdata_key key, void *value)
+{
+	if (pthread_setspecific(key, value) != 0)
+		return -1;
+
+	return 0;
+}
+
+void *git_tlsdata_get(git_tlsdata_key key)
+{
+	return pthread_getspecific(key);
+}
+
+int git_tlsdata_dispose(git_tlsdata_key key)
+{
+	if (pthread_key_delete(key) != 0)
+		return -1;
+
+	return 0;
+}
+
+#else
+# error unknown threading model
+#endif