mirror of https://github.com/BOINC/boinc.git
251 lines
6.5 KiB
C
Executable File
251 lines
6.5 KiB
C
Executable File
// Berkeley Open Infrastructure for Network Computing
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// http://boinc.berkeley.edu
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// Copyright (C) 2005 University of California
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//
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// This is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation;
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// either version 2.1 of the License, or (at your option) any later version.
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//
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// This software is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU Lesser General Public License for more details.
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//
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// To view the GNU Lesser General Public License visit
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// http://www.gnu.org/copyleft/lesser.html
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// or write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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// The part of the BOINC API having to do with graphics.
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// This is the implementation level,
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// which doesn't directly refer to boinc_init_options()
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// and thus can be put in a shared library,
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// separate from the application.
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#include "config.h"
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#ifdef _WIN32
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#include "boinc_win.h"
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extern void win_graphics_event_loop();
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#endif
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#ifndef _WIN32
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#include <cstring>
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#include <cstdarg>
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#ifdef HAVE_PTHREAD
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#include <pthread.h>
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#include <sched.h>
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#endif
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#include "x_opengl.h"
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#endif
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#include "parse.h"
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#include "util.h"
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#include "app_ipc.h"
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#include "error_numbers.h"
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#include "filesys.h"
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#include "graphics_api.h"
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#include "graphics_impl.h"
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double boinc_max_fps = 30.;
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double boinc_max_gfx_cpu_frac = 0.5;
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#ifdef _WIN32
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HANDLE hQuitEvent;
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#endif
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BOINC_MAIN_STATE* g_bmsp;
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static WORKER_FUNC_PTR worker_main;
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#ifndef _WIN32
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pthread_t worker_thread;
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pthread_t graphics_thread;
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#endif
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#ifdef _WIN32
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DWORD WINAPI foobar(LPVOID) {
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#else
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void* foobar(void*) {
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#endif
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g_bmsp->set_worker_timer_hook();
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worker_main();
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return 0;
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}
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// the following function can be in a shared library,
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// so it calls boinc_init_options_general() via a pointer instead of directly
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//
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int boinc_init_graphics_impl(WORKER_FUNC_PTR worker, BOINC_MAIN_STATE* bmsp) {
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BOINC_OPTIONS opt;
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boinc_options_defaults(opt);
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return boinc_init_options_graphics_impl(opt, worker, bmsp);
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}
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int start_worker_thread(WORKER_FUNC_PTR _worker_main) {
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worker_main = _worker_main;
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#ifdef _WIN32
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// Create the event object used to signal between the
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// worker and event threads
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hQuitEvent = CreateEvent(
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NULL, // no security attributes
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TRUE, // manual reset event
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TRUE, // initial state is signaled
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NULL // object not named
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);
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DWORD threadId;
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// Create the graphics thread, passing it the graphics info
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// TODO: is it better to use _beginthreadex here?
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//
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worker_thread_handle = CreateThread(
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NULL, 0, foobar, 0, CREATE_SUSPENDED, &threadId
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);
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// raise priority of graphics thread (i.e. current thread)
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//
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HANDLE h = GetCurrentThread();
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SetThreadPriority(h, THREAD_PRIORITY_HIGHEST);
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// lower worker thread priority
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//
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SetThreadPriority(worker_thread_handle, THREAD_PRIORITY_LOWEST);
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// Start the worker thread
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//
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ResumeThread(worker_thread_handle);
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#else
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pthread_attr_t worker_thread_attr;
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sched_param param;
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int retval, currentpolicy, minpriority;
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// make the worker thread low priority
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// (current thread, i.e. graphics thread, should remain high priority)
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//
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retval = pthread_attr_init(&worker_thread_attr);
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if (retval) return ERR_THREAD;
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retval = pthread_attr_getschedparam(&worker_thread_attr, ¶m);
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if (retval) return ERR_THREAD;
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// Note: this sets the scheduling policy for the worker thread to
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// be the same as the scheduling policy of the main thread.
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// This may not be a wise choice.
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//
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retval = pthread_attr_getschedpolicy(&worker_thread_attr, ¤tpolicy);
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if (retval) return ERR_THREAD;
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minpriority = sched_get_priority_min(currentpolicy);
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if (minpriority == -1) return ERR_THREAD;
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param.sched_priority = minpriority;
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retval = pthread_attr_setschedparam(&worker_thread_attr, ¶m);
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if (retval) return ERR_THREAD;
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// initialze thread-id of calling thread (which is the graphics-thread!)
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graphics_thread = pthread_self();
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retval = pthread_create(&worker_thread, &worker_thread_attr, foobar, 0);
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if (retval) return ERR_THREAD;
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pthread_attr_destroy( &worker_thread_attr );
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#endif
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return 0;
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}
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int boinc_init_options_graphics_impl(
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BOINC_OPTIONS& opt,
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WORKER_FUNC_PTR _worker_main,
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BOINC_MAIN_STATE* bmsp
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) {
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int retval;
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g_bmsp = bmsp;
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retval = g_bmsp->boinc_init_options_general_hook(opt);
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if (retval) return retval;
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if (_worker_main) {
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retval = start_worker_thread(_worker_main);
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if (retval) return retval;
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}
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#ifdef _WIN32
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win_graphics_event_loop();
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fprintf(stderr, "Graphics event loop returned\n");
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#else
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xwin_graphics_event_loop();
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fprintf(stderr, "Graphics event loop returned\n");
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pthread_exit(0);
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#endif
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// normally we never get here
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return 0;
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}
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#ifndef _WIN32
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extern "C" {
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void glut_quit() {
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pthread_exit(0);
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}
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}
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#endif
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bool throttled_app_render(int x, int y, double t) {
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static double total_render_time = 0;
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static double time_until_render = 0;
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static double last_now = 0;
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static double elapsed_time = 0;
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double now, t0, t1, diff, frac;
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bool ok_to_render;
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ok_to_render = true;
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now = dtime();
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diff = now - last_now;
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last_now = now;
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if (diff > 1000) diff = 0; // handle initial case
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// enforce frames/sec restriction
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//
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if (boinc_max_fps) {
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time_until_render -= diff;
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if (time_until_render < 0) {
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time_until_render += 1./boinc_max_fps;
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} else {
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ok_to_render = false;
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}
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}
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// enforce max CPU time restriction
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//
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if (boinc_max_gfx_cpu_frac) {
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elapsed_time += diff;
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if (elapsed_time) {
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frac = total_render_time/elapsed_time;
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if (frac > boinc_max_gfx_cpu_frac) {
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ok_to_render = false;
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}
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}
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}
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// render if allowed
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//
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if (ok_to_render) {
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if (boinc_max_gfx_cpu_frac) {
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boinc_calling_thread_cpu_time(t0);
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}
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app_graphics_render(x, y, t);
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if (boinc_max_gfx_cpu_frac) {
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boinc_calling_thread_cpu_time(t1);
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total_render_time += t1 - t0;
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}
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return true;
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}
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return false;
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}
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const char *BOINC_RCSID_6e92742852 = "$Id$";
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