Made httplib_pthread_mutex_destroy global

doc/api/httplib_pthread_mutex_destroy.md

@@ -0,0 +1,26 @@
+# LibHTTP API Reference
+
+### `httplib_pthread_mutex_destroy( mutex );`
+
+### Parameters
+
+| Parameter | Type | Description |
+| :--- | :--- | :--- |
+|**`mutex`**|`pthread_mutex_t`|The key to the mutex to destroy|
+
+### Return Value
+
+| Type | Description |
+| :--- | :--- |
+|`int`|Integer value with the result of the function|
+
+### Description
+
+The platform independent function `httplib_pthread_mutex_destroy()` destroys a mutex and frees the allocated resources. The function returns **0** if this is successful, or an error code if it fails. If a mutex is locked by another thread the function will return with an error code. On systems which support it, this function is implemented as a wrapper around `pthread_mutex_destroy()`. On other systems own code is used to emulate the same functionality.
+
+### See Also
+
+* [`httplib_pthread_mutex_init();`](httplib_pthread_mutex_init.md)
+* [`httplib_pthread_mutex_lock();`](httplib_pthread_mutex_lock.md)
+* [`httplib_pthread_mutex_trylock();`](httplib_pthread_mutex_trylock.md)
+* [`httplib_pthread_mutex_unlock();`](httplib_pthread_mutex_unlock.md)