src/thread/pthread/SDL_systhread.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 25 Mar 2011 10:47:49 -0700
changeset 5506 82a09d5d0f07
parent 5262 b530ef003506
child 5509 5b1b4d820d10
permissions -rw-r--r--
Implemented SDL_SetThreadPriority()
slouken@1361
     1
/*
slouken@1361
     2
    SDL - Simple DirectMedia Layer
slouken@5262
     3
    Copyright (C) 1997-2011 Sam Lantinga
slouken@1361
     4
slouken@1361
     5
    This library is free software; you can redistribute it and/or
slouken@1361
     6
    modify it under the terms of the GNU Lesser General Public
slouken@1361
     7
    License as published by the Free Software Foundation; either
slouken@1361
     8
    version 2.1 of the License, or (at your option) any later version.
slouken@1361
     9
slouken@1361
    10
    This library is distributed in the hope that it will be useful,
slouken@1361
    11
    but WITHOUT ANY WARRANTY; without even the implied warranty of
slouken@1361
    12
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
slouken@1361
    13
    Lesser General Public License for more details.
slouken@1361
    14
slouken@1361
    15
    You should have received a copy of the GNU Lesser General Public
slouken@1361
    16
    License along with this library; if not, write to the Free Software
slouken@1361
    17
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
slouken@1361
    18
slouken@1361
    19
    Sam Lantinga
slouken@1361
    20
    slouken@libsdl.org
slouken@1361
    21
*/
slouken@1402
    22
#include "SDL_config.h"
slouken@1361
    23
slouken@1361
    24
#include <pthread.h>
slouken@1361
    25
#include <signal.h>
slouken@1361
    26
slouken@1361
    27
#include "SDL_thread.h"
slouken@1361
    28
#include "../SDL_thread_c.h"
slouken@1361
    29
#include "../SDL_systhread.h"
slouken@1361
    30
slouken@1361
    31
/* List of signals to mask in the subthreads */
slouken@3162
    32
static const int sig_list[] = {
slouken@1895
    33
    SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
slouken@1895
    34
    SIGVTALRM, SIGPROF, 0
slouken@1361
    35
};
slouken@1361
    36
slouken@1895
    37
static void *
slouken@1895
    38
RunThread(void *data)
slouken@1361
    39
{
slouken@1895
    40
    SDL_RunThread(data);
slouken@1895
    41
    pthread_exit((void *) 0);
slouken@1895
    42
    return ((void *) 0);        /* Prevent compiler warning */
slouken@1361
    43
}
slouken@1361
    44
slouken@1895
    45
int
slouken@1895
    46
SDL_SYS_CreateThread(SDL_Thread * thread, void *args)
slouken@1361
    47
{
slouken@1895
    48
    pthread_attr_t type;
slouken@1361
    49
slouken@1895
    50
    /* Set the thread attributes */
slouken@1895
    51
    if (pthread_attr_init(&type) != 0) {
slouken@1895
    52
        SDL_SetError("Couldn't initialize pthread attributes");
slouken@1895
    53
        return (-1);
slouken@1895
    54
    }
slouken@1895
    55
    pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);
slouken@1361
    56
slouken@1895
    57
    /* Create the thread and go! */
slouken@1895
    58
    if (pthread_create(&thread->handle, &type, RunThread, args) != 0) {
slouken@1895
    59
        SDL_SetError("Not enough resources to create thread");
slouken@1895
    60
        return (-1);
slouken@1895
    61
    }
slouken@1459
    62
slouken@1895
    63
    return (0);
slouken@1361
    64
}
slouken@1361
    65
slouken@1895
    66
void
slouken@1895
    67
SDL_SYS_SetupThread(void)
slouken@1361
    68
{
slouken@1895
    69
    int i;
slouken@1895
    70
    sigset_t mask;
slouken@1361
    71
slouken@1895
    72
    /* Mask asynchronous signals for this thread */
slouken@1895
    73
    sigemptyset(&mask);
slouken@1895
    74
    for (i = 0; sig_list[i]; ++i) {
slouken@1895
    75
        sigaddset(&mask, sig_list[i]);
slouken@1895
    76
    }
slouken@1895
    77
    pthread_sigmask(SIG_BLOCK, &mask, 0);
slouken@1361
    78
slouken@1361
    79
#ifdef PTHREAD_CANCEL_ASYNCHRONOUS
slouken@1895
    80
    /* Allow ourselves to be asynchronously cancelled */
slouken@1895
    81
    {
slouken@1895
    82
        int oldstate;
slouken@1895
    83
        pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);
slouken@1895
    84
    }
slouken@1361
    85
#endif
slouken@1361
    86
}
slouken@1361
    87
slouken@3578
    88
SDL_threadID
slouken@1895
    89
SDL_ThreadID(void)
slouken@1361
    90
{
slouken@3578
    91
    return ((SDL_threadID) pthread_self());
slouken@1361
    92
}
slouken@1361
    93
slouken@5506
    94
int
slouken@5506
    95
SDL_SYS_SetThreadPriority(SDL_Thread * thread, SDL_ThreadPriority priority)
slouken@5506
    96
{
slouken@5506
    97
    struct sched_param sched;
slouken@5506
    98
    int policy;
slouken@5506
    99
slouken@5506
   100
    if (pthread_getschedparam(thread->handle, &policy, &sched) < 0) {
slouken@5506
   101
        SDL_SetError("pthread_getschedparam() failed");
slouken@5506
   102
        return -1;
slouken@5506
   103
    }
slouken@5506
   104
    if (priority == SDL_THREAD_PRIORITY_LOW) {
slouken@5506
   105
        sched.sched_priority = sched_get_priority_min(policy);
slouken@5506
   106
    } else if (priority == SDL_THREAD_PRIORITY_HIGH) {
slouken@5506
   107
        sched.sched_priority = sched_get_priority_max(policy);
slouken@5506
   108
    } else {
slouken@5506
   109
        int min_priority = sched_get_priority_min(policy);
slouken@5506
   110
        int max_priority = sched_get_priority_max(policy);
slouken@5506
   111
        int priority = (min_priority + (max_priority - min_priority) / 2);
slouken@5506
   112
        sched.sched_priority = priority;
slouken@5506
   113
    }
slouken@5506
   114
    if (pthread_setschedparam(thread->handle, policy, &sched) < 0) {
slouken@5506
   115
        SDL_SetError("pthread_setschedparam() failed");
slouken@5506
   116
        return -1;
slouken@5506
   117
    }
slouken@5506
   118
    return 0;
slouken@5506
   119
}
slouken@5506
   120
slouken@1895
   121
void
slouken@1895
   122
SDL_SYS_WaitThread(SDL_Thread * thread)
slouken@1361
   123
{
slouken@1895
   124
    pthread_join(thread->handle, 0);
slouken@1361
   125
}
slouken@1361
   126
slouken@1895
   127
/* vi: set ts=4 sw=4 expandtab: */