From 471ff4a9998aed7b5b9a25217d35c458b1f86d2f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Higor=20Eur=C3=ADpedes?= <heuripedes@gmail.com>
Date: Mon, 17 Oct 2016 20:49:37 -0300
Subject: [PATCH] (libretro-common) Add thread local storage

---
 libretro-common/include/rthreads/rthreads.h | 41 +++++++++++++++++++++
 libretro-common/rthreads/rthreads.c         | 36 ++++++++++++++++++
 2 files changed, 77 insertions(+)

diff --git a/libretro-common/include/rthreads/rthreads.h b/libretro-common/include/rthreads/rthreads.h
index a960d7f8ec..86d1fde8b0 100644
--- a/libretro-common/include/rthreads/rthreads.h
+++ b/libretro-common/include/rthreads/rthreads.h
@@ -35,6 +35,7 @@ RETRO_BEGIN_DECLS
 typedef struct sthread sthread_t;
 typedef struct slock slock_t;
 typedef struct scond scond_t;
+typedef unsigned sthread_tls_t;
 
 /**
  * sthread_create:
@@ -178,6 +179,46 @@ int scond_broadcast(scond_t *cond);
  **/
 void scond_signal(scond_t *cond);
 
+/**
+ * @brief Creates a thread local storage key
+ *
+ * This function shall create thread-specific data key visible to all threads in
+ * the process. The same key can be used by multiple threads to store
+ * thread-local data.
+ *
+ * When the key is created NULL shall be associated with it in all active
+ * threads. Whenever a new thread is spawned the all defined keys will be
+ * associated with NULL on that thread.
+ *
+ * @param tls
+ * @return whether the operation suceeded or not
+ */
+bool sthread_tls_create(sthread_tls_t *tls);
+
+/**
+ * @brief Deletes a thread local storage
+ * @param tls
+ * @return whether the operation suceeded or not
+ */
+bool sthread_tls_delete(sthread_tls_t *tls);
+
+/**
+ * @brief Retrieves thread specific data associated with a key
+ *
+ * There is no way to tell whether this function failed.
+ *
+ * @param tls
+ * @return
+ */
+void *sthread_tls_get(sthread_tls_t *tls);
+
+/**
+ * @brief Binds thread specific data to a key
+ * @param tls
+ * @return whether the operation suceeded or not
+ */
+bool sthread_tls_set(sthread_tls_t *tls, const void *data);
+
 RETRO_END_DECLS
 
 #endif
diff --git a/libretro-common/rthreads/rthreads.c b/libretro-common/rthreads/rthreads.c
index 1c17d650b7..aca3bd1e88 100644
--- a/libretro-common/rthreads/rthreads.c
+++ b/libretro-common/rthreads/rthreads.c
@@ -474,3 +474,39 @@ bool scond_wait_timeout(scond_t *cond, slock_t *lock, int64_t timeout_us)
    return (ret == 0);
 #endif
 }
+
+bool sthread_tls_create(sthread_tls_t *tls)
+{
+#ifdef USE_WIN32_THREADS
+   return (*tls = TlsAlloc()) != TLS_OUT_OF_INDEXES;
+#else
+   return pthread_key_create(tls, NULL) == 0;
+#endif
+}
+
+bool sthread_tls_delete(sthread_tls_t *tls)
+{
+#ifdef USE_WIN32_THREADS
+   return TlsFree(*tls) != 0;
+#else
+   return pthread_key_delete(*tls) == 0;
+#endif
+}
+
+void *sthread_tls_get(sthread_tls_t *tls)
+{
+#ifdef USE_WIN32_THREADS
+   return TlsGetValue(*tls);
+#else
+   return pthread_getspecific(*tls);
+#endif
+}
+
+bool sthread_tls_set(sthread_tls_t *tls, const void *data)
+{
+#ifdef USE_WIN32_THREADS
+   return TlsSetValue(*tls, (void*)data) != 0;
+#else
+   return pthread_setspecific(*tls, data) == 0;
+#endif
+}