sdl-ios-xcode: src/thread/dc/SDL

annotate src/thread/dc/SDL_syscond.c @ 2661:d38309be5178 gsoc2008_audio_resampling

The windowed sinc filter generation code seems to be working fine. The FIR filtering code is also now working reasonably well. Occasionally the FIR filter will pop, but setting the normalization factor lower seems to help this. I suspect the problem is in the fixed point multiply/add. I also have a hunch the zero stuffing/sample discarding code is not correct, and I'll look at that soon to get it sorted out.

author	Aaron Wishnick <schnarf@gmail.com>
date	Wed, 02 Jul 2008 08:04:50 +0000
parents	c121d94672cb
children	99210400e8b9

rev	line source
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	1 /*
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	2 SDL - Simple DirectMedia Layer
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	3 Copyright (C) 1997-2006 Sam Lantinga
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	4
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	5 This library is free software; you can redistribute it and/or
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	6 modify it under the terms of the GNU Lesser General Public
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	7 License as published by the Free Software Foundation; either
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	8 version 2.1 of the License, or (at your option) any later version.
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	9
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	10 This library is distributed in the hope that it will be useful,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	13 Lesser General Public License for more details.
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	14
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	15 You should have received a copy of the GNU Lesser General Public
c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	16 License along with this library; if not, write to the Free Software
c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	18
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	19 Sam Lantinga
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	20 slouken@libsdl.org
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	21 */
1402 d910939febfa Use consistent identifiers for the various platforms we support. Sam Lantinga <slouken@libsdl.org> parents: 1358 diff changeset	22 #include "SDL_config.h"
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	23
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	24 /* An implementation of condition variables using semaphores and mutexes */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	25 /*
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	26 This implementation borrows heavily from the BeOS condition variable
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	27 implementation, written by Christopher Tate and Owen Smith. Thanks!
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	28 */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	29
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	30 #include "SDL_thread.h"
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	31
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	32 struct SDL_cond
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	33 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	34 SDL_mutex *lock;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	35 int waiting;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	36 int signals;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	37 SDL_sem *wait_sem;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	38 SDL_sem *wait_done;
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	39 };
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	40
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	41 /* Create a condition variable */
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	42 SDL_cond *
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	43 SDL_CreateCond(void)
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	44 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	45 SDL_cond *cond;
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	46
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	47 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	48 if (cond) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	49 cond->lock = SDL_CreateMutex();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	50 cond->wait_sem = SDL_CreateSemaphore(0);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	51 cond->wait_done = SDL_CreateSemaphore(0);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	52 cond->waiting = cond->signals = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	53 if (!cond->lock \|\| !cond->wait_sem \|\| !cond->wait_done) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	54 SDL_DestroyCond(cond);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	55 cond = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	56 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	57 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	58 SDL_OutOfMemory();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	59 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	60 return (cond);
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	61 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	62
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	63 /* Destroy a condition variable */
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	64 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	65 SDL_DestroyCond(SDL_cond * cond)
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	66 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	67 if (cond) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	68 if (cond->wait_sem) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	69 SDL_DestroySemaphore(cond->wait_sem);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	70 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	71 if (cond->wait_done) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	72 SDL_DestroySemaphore(cond->wait_done);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	73 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	74 if (cond->lock) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	75 SDL_DestroyMutex(cond->lock);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	76 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	77 SDL_free(cond);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	78 }
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	79 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	80
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	81 /* Restart one of the threads that are waiting on the condition variable */
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	82 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	83 SDL_CondSignal(SDL_cond * cond)
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	84 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	85 if (!cond) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	86 SDL_SetError("Passed a NULL condition variable");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	87 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	88 }
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	89
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	90 /* If there are waiting threads not already signalled, then
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	91 signal the condition and wait for the thread to respond.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	92 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	93 SDL_LockMutex(cond->lock);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	94 if (cond->waiting > cond->signals) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	95 ++cond->signals;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	96 SDL_SemPost(cond->wait_sem);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	97 SDL_UnlockMutex(cond->lock);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	98 SDL_SemWait(cond->wait_done);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	99 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	100 SDL_UnlockMutex(cond->lock);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	101 }
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	102
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	103 return 0;
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	104 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	105
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	106 /* Restart all threads that are waiting on the condition variable */
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	107 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	108 SDL_CondBroadcast(SDL_cond * cond)
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	109 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	110 if (!cond) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	111 SDL_SetError("Passed a NULL condition variable");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	112 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	113 }
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	114
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	115 /* If there are waiting threads not already signalled, then
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	116 signal the condition and wait for the thread to respond.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	117 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	118 SDL_LockMutex(cond->lock);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	119 if (cond->waiting > cond->signals) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	120 int i, num_waiting;
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	121
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	122 num_waiting = (cond->waiting - cond->signals);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	123 cond->signals = cond->waiting;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	124 for (i = 0; i < num_waiting; ++i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	125 SDL_SemPost(cond->wait_sem);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	126 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	127 /* Now all released threads are blocked here, waiting for us.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	128 Collect them all (and win fabulous prizes!) :-)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	129 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	130 SDL_UnlockMutex(cond->lock);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	131 for (i = 0; i < num_waiting; ++i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	132 SDL_SemWait(cond->wait_done);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	133 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	134 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	135 SDL_UnlockMutex(cond->lock);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	136 }
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	137
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	138 return 0;
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	139 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	140
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	141 /* Wait on the condition variable for at most 'ms' milliseconds.
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	142 The mutex must be locked before entering this function!
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	143 The mutex is unlocked during the wait, and locked again after the wait.
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	144
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	145 Typical use:
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	146
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	147 Thread A:
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	148 SDL_LockMutex(lock);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	149 while ( ! condition ) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	150 SDL_CondWait(cond);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	151 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	152 SDL_UnlockMutex(lock);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	153
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	154 Thread B:
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	155 SDL_LockMutex(lock);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	156 ...
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	157 condition = true;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	158 ...
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	159 SDL_UnlockMutex(lock);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	160 */
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	161 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	162 SDL_CondWaitTimeout(SDL_cond * cond, SDL_mutex * mutex, Uint32 ms)
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	163 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	164 int retval;
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	165
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	166 if (!cond) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	167 SDL_SetError("Passed a NULL condition variable");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	168 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	169 }
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	170
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	171 /* Obtain the protection mutex, and increment the number of waiters.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	172 This allows the signal mechanism to only perform a signal if there
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	173 are waiting threads.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	174 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	175 SDL_LockMutex(cond->lock);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	176 ++cond->waiting;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	177 SDL_UnlockMutex(cond->lock);
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	178
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	179 /* Unlock the mutex, as is required by condition variable semantics */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	180 SDL_UnlockMutex(mutex);
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	181
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	182 /* Wait for a signal */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	183 if (ms == SDL_MUTEX_MAXWAIT) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	184 retval = SDL_SemWait(cond->wait_sem);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	185 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	186 retval = SDL_SemWaitTimeout(cond->wait_sem, ms);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	187 }
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	188
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	189 /* Let the signaler know we have completed the wait, otherwise
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	190 the signaler can race ahead and get the condition semaphore
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	191 if we are stopped between the mutex unlock and semaphore wait,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	192 giving a deadlock. See the following URL for details:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	193 http://www-classic.be.com/aboutbe/benewsletter/volume_III/Issue40.html
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	194 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	195 SDL_LockMutex(cond->lock);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	196 if (cond->signals > 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	197 /* If we timed out, we need to eat a condition signal */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	198 if (retval > 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	199 SDL_SemWait(cond->wait_sem);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	200 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	201 /* We always notify the signal thread that we are done */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	202 SDL_SemPost(cond->wait_done);
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	203
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	204 /* Signal handshake complete */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	205 --cond->signals;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	206 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	207 --cond->waiting;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	208 SDL_UnlockMutex(cond->lock);
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	209
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	210 /* Lock the mutex, as is required by condition variable semantics */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	211 SDL_LockMutex(mutex);
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	212
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	213 return retval;
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	214 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	215
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	216 /* Wait on the condition variable forever */
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	217 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	218 SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex)
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	219 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	220 return SDL_CondWaitTimeout(cond, mutex, SDL_MUTEX_MAXWAIT);
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	221 }
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	222
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	223 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/thread/dc/SDL_syscond.c @ 2661:d38309be5178 gsoc2008_audio_resampling