1 files changed, 71 insertions, 0 deletions
diff --git a/threadpool.h b/threadpool.h
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+/*
+ * Copyright 2016-2018 Anton Khirnov <anton@khirnov.net>
+ *
+ * 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
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TP_THREADPOOL_H
+#define TP_THREADPOOL_H
+
+/**
+ * The thread pool object, allocated by tp_init() and destroyed by tp_free().
+ */
+typedef struct TPContext TPContext;
+
+/**
+ * The callback passed to tp_execute().
+ *
+ * @param arg the user pointer supplied to tp_execute
+ * @param job_idx the job index, between 0 and nb_jobs
+ * @param thread_idx the index of the thread executing this job, between 0 and
+ *                   nb_threads
+ *
+ * @return the callback should return 0 on success and a negative number on
+ *         failure
+ */
+typedef int (*TPExecuteCallback)(void *arg, unsigned int job_idx, unsigned int thread_idx);
+
+/**
+ * Create the thread pool object.
+ *
+ * @param ctx the newly created thread pool will be written here
+ * @param nb_threads the number of threads to execute in parallel
+ * @return 0 on success, a negative error code on failure
+ */
+int  tp_init(TPContext **ctx, unsigned int nb_threads);
+/**
+ * Free the thread pool object and write NULL into the supplied pointer.
+ */
+void tp_free(TPContext **ctx);
+
+/**
+ * Execute a function multiple times in parallel.
+ *
+ * @param ctx the thread pool object
+ * @param nb_jobs number of times to call func
+ * @param func the callback to call
+ * @param func_arg arbitrary user data to pass to func
+ *
+ * @return 0 if all the calls to func returned successfully, a negative error
+ * code otherwise
+ */
+int tp_execute(TPContext *ctx, unsigned int nb_jobs,
+               TPExecuteCallback func, void *func_arg);
+
+/**
+ * Get the number of threads in this thread pool.
+ */
+unsigned int tp_get_nb_threads(TPContext *ctx);
+
+#endif /* TP_THREADPOOL_H */