contrib/python-zstandard/zstd/common/threading.c

rhg: Port Python’s `ui.configlist` as `Config::get_list`

This new method is not used yet outside of its own unit tests,
so this changeset should make no observable change.

The Rust parser implementation attempts to exactly replicate the behavior of
the Python one, even in edge cases where that behavior is… surprising.
New unit tests capture some of these edge cases.

This started as a line-by-line port. The main changes are:

* Pass around a parser mode enum instead of parser functions
* Inline the whole parser into one function
* Use `[u8]::get` which returns an `Option`,
  instead of indexing  after explicitly checking the length.

Differential Revision: https://phab.mercurial-scm.org/D11389

/**
 * Copyright (c) 2016 Tino Reichardt
 * All rights reserved.
 *
 * This source code is licensed under both the BSD-style license (found in the
 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
 * in the COPYING file in the root directory of this source tree).
 *
 * You can contact the author at:
 * - zstdmt source repository: https://github.com/mcmilk/zstdmt
 */

/**
 * This file will hold wrapper for systems, which do not support pthreads
 */

#include "threading.h"

/* create fake symbol to avoid empty translation unit warning */
int g_ZSTD_threading_useless_symbol;

#if defined(ZSTD_MULTITHREAD) && defined(_WIN32)

/**
 * Windows minimalist Pthread Wrapper, based on :
 * http://www.cse.wustl.edu/~schmidt/win32-cv-1.html
 */


/* ===  Dependencies  === */
#include <process.h>
#include <errno.h>


/* ===  Implementation  === */

static unsigned __stdcall worker(void *arg)
{
    ZSTD_pthread_t* const thread = (ZSTD_pthread_t*) arg;
    thread->arg = thread->start_routine(thread->arg);
    return 0;
}

int ZSTD_pthread_create(ZSTD_pthread_t* thread, const void* unused,
            void* (*start_routine) (void*), void* arg)
{
    (void)unused;
    thread->arg = arg;
    thread->start_routine = start_routine;
    thread->handle = (HANDLE) _beginthreadex(NULL, 0, worker, thread, 0, NULL);

    if (!thread->handle)
        return errno;
    else
        return 0;
}

int ZSTD_pthread_join(ZSTD_pthread_t thread, void **value_ptr)
{
    DWORD result;

    if (!thread.handle) return 0;

    result = WaitForSingleObject(thread.handle, INFINITE);
    switch (result) {
    case WAIT_OBJECT_0:
        if (value_ptr) *value_ptr = thread.arg;
        return 0;
    case WAIT_ABANDONED:
        return EINVAL;
    default:
        return GetLastError();
    }
}

#endif   /* ZSTD_MULTITHREAD */

#if defined(ZSTD_MULTITHREAD) && DEBUGLEVEL >= 1 && !defined(_WIN32)

#include <stdlib.h>

int ZSTD_pthread_mutex_init(ZSTD_pthread_mutex_t* mutex, pthread_mutexattr_t const* attr)
{
    *mutex = (pthread_mutex_t*)malloc(sizeof(pthread_mutex_t));
    if (!*mutex)
        return 1;
    return pthread_mutex_init(*mutex, attr);
}

int ZSTD_pthread_mutex_destroy(ZSTD_pthread_mutex_t* mutex)
{
    if (!*mutex)
        return 0;
    {
        int const ret = pthread_mutex_destroy(*mutex);
        free(*mutex);
        return ret;
    }
}

int ZSTD_pthread_cond_init(ZSTD_pthread_cond_t* cond, pthread_condattr_t const* attr)
{
    *cond = (pthread_cond_t*)malloc(sizeof(pthread_cond_t));
    if (!*cond)
        return 1;
    return pthread_cond_init(*cond, attr);
}

int ZSTD_pthread_cond_destroy(ZSTD_pthread_cond_t* cond)
{
    if (!*cond)
        return 0;
    {
        int const ret = pthread_cond_destroy(*cond);
        free(*cond);
        return ret;
    }
}

#endif