s3: Tiny doc for pthreadpool

source3/lib/pthreadpool/pthreadpool.h

@@ -1,7 +1,7 @@
 /*
  * Unix SMB/CIFS implementation.
  * threadpool implementation based on pthreads
- * Copyright (C) Volker Lendecke 2009
+ * Copyright (C) Volker Lendecke 2009,2011
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -22,21 +22,73 @@
 
 struct pthreadpool;
 
+/**
+ * @defgroup pthreadpool The pthreadpool API
+ *
+ * This API provides a way to run threadsafe functions in a helper
+ * thread. It is initially intended to run getaddrinfo asynchronously.
+ */
+
+
+/**
+ * @brief Create a pthreadpool
+ *
+ * A struct pthreadpool is the basis for for running threads in the
+ * background.
+ *
+ * @param[in]	max_threads	Maximum parallelism in this pool
+ * @param[out]	presult		Pointer to the threadpool returned
+ * @return			success: 0, failure: errno
+ */
 int pthreadpool_init(unsigned max_threads, struct pthreadpool **presult);
+
+/**
+ * @brief Destroy a pthreadpool
+ *
+ * Destroy a pthreadpool. If jobs are still active, this returns
+ * EBUSY.
+ *
+ * @param[in]	pool		The pool to destroy
+ * @return			success: 0, failure: errno
+ */
 int pthreadpool_destroy(struct pthreadpool *pool);
 
-/*
- * Add a job to a pthreadpool.
+/**
+ * @brief Add a job to a pthreadpool
+ *
+ * This adds a job to a pthreadpool. The job can be identified by
+ * job_id. This integer will be returned from
+ * pthreadpool_finished_job() then the job is completed.
+ *
+ * @param[in]	pool		The pool to run the job on
+ * @param[in]	job_id		A custom identifier
+ * @param[in]	fn		The function to run asynchronously
+ * @param[in]	private_data	Pointer passed to fn
+ * @return			success: 0, failure: errno
  */
 int pthreadpool_add_job(struct pthreadpool *pool, int job_id,
 			void (*fn)(void *private_data), void *private_data);
 
-/*
- * Get the signalling fd out of a thread pool. This fd will become readable
- * when a job is finished. The job that finished can be retrieved via
- * pthreadpool_finished_job().
+/**
+ * @brief Get the signalling fd from a pthreadpool
+ *
+ * Completion of a job is indicated by readability of the fd retuned
+ * by pthreadpool_sig_fd().
+ *
+ * @param[in]	pool		The pool in question
+ * @return			The fd to listen on for readability
  */
 int pthreadpool_sig_fd(struct pthreadpool *pool);
+
+/**
+ * @brief Get the job_id of a finished job
+ *
+ * This blocks until a job has finished unless the fd returned by
+ * pthreadpool_sig_fd() is readable.
+ *
+ * @param[in]	pool		The pool to query for finished jobs
+ * @return			The job_id of the finished job
+ */
 int pthreadpool_finished_job(struct pthreadpool *pool);
 
 #endif