| 1 | /*
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| 2 | * Unix SMB/CIFS implementation.
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| 3 | * threadpool implementation based on pthreads
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| 4 | * Copyright (C) Volker Lendecke 2009,2011
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify
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| 7 | * it under the terms of the GNU General Public License as published by
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| 8 | * the Free Software Foundation; either version 3 of the License, or
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| 9 | * (at your option) any later version.
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| 10 | *
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| 11 | * This program is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | * GNU General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU General Public License
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| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 18 | */
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| 19 |
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| 20 | #ifndef __PTHREADPOOL_H__
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| 21 | #define __PTHREADPOOL_H__
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| 22 |
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| 23 | struct pthreadpool;
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| 24 |
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| 25 | /**
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| 26 | * @defgroup pthreadpool The pthreadpool API
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| 27 | *
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| 28 | * This API provides a way to run threadsafe functions in a helper
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| 29 | * thread. It is initially intended to run getaddrinfo asynchronously.
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| 30 | */
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| 31 |
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| 32 |
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| 33 | /**
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| 34 | * @brief Create a pthreadpool
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| 35 | *
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| 36 | * A struct pthreadpool is the basis for for running threads in the
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| 37 | * background.
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| 38 | *
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| 39 | * @param[in] max_threads Maximum parallelism in this pool
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| 40 | * @param[out] presult Pointer to the threadpool returned
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| 41 | * @return success: 0, failure: errno
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| 42 | *
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| 43 | * max_threads=0 means unlimited parallelism. The caller has to take
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| 44 | * care to not overload the system.
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| 45 | */
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| 46 | int pthreadpool_init(unsigned max_threads, struct pthreadpool **presult);
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| 47 |
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| 48 | /**
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| 49 | * @brief Destroy a pthreadpool
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| 50 | *
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| 51 | * Destroy a pthreadpool. If jobs are still active, this returns
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| 52 | * EBUSY.
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| 53 | *
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| 54 | * @param[in] pool The pool to destroy
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| 55 | * @return success: 0, failure: errno
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| 56 | */
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| 57 | int pthreadpool_destroy(struct pthreadpool *pool);
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| 58 |
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| 59 | /**
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| 60 | * @brief Add a job to a pthreadpool
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| 61 | *
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| 62 | * This adds a job to a pthreadpool. The job can be identified by
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| 63 | * job_id. This integer will be returned from
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| 64 | * pthreadpool_finished_jobs() then the job is completed.
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| 65 | *
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| 66 | * @param[in] pool The pool to run the job on
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| 67 | * @param[in] job_id A custom identifier
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| 68 | * @param[in] fn The function to run asynchronously
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| 69 | * @param[in] private_data Pointer passed to fn
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| 70 | * @return success: 0, failure: errno
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| 71 | */
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| 72 | int pthreadpool_add_job(struct pthreadpool *pool, int job_id,
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| 73 | void (*fn)(void *private_data), void *private_data);
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| 74 |
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| 75 | /**
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| 76 | * @brief Get the signalling fd from a pthreadpool
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| 77 | *
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| 78 | * Completion of a job is indicated by readability of the fd returned
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| 79 | * by pthreadpool_signal_fd().
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| 80 | *
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| 81 | * @param[in] pool The pool in question
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| 82 | * @return The fd to listen on for readability
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| 83 | */
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| 84 | int pthreadpool_signal_fd(struct pthreadpool *pool);
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| 85 |
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| 86 | /**
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| 87 | * @brief Get the job_ids of finished jobs
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| 88 | *
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| 89 | * This blocks until a job has finished unless the fd returned by
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| 90 | * pthreadpool_signal_fd() is readable.
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| 91 | *
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| 92 | * @param[in] pool The pool to query for finished jobs
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| 93 | * @param[out] jobids The job_ids of the finished job
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| 94 | * @param[int] num_jobids The job_ids array size
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| 95 | * @return success: >=0, number of finished jobs
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| 96 | * failure: -errno
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| 97 | */
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| 98 | int pthreadpool_finished_jobs(struct pthreadpool *pool, int *jobids,
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| 99 | unsigned num_jobids);
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| 100 |
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| 101 | #endif
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