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Use critical sections for WildMidi locking

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...because when you're trying to be thread-safe, it's generally a good
idea to use mechanisms that work across multiple processor cores.
This commit is contained in:
Randy Heit 2015-12-29 16:24:16 -06:00
parent 14361d9313
commit 900937929e
5 changed files with 54 additions and 173 deletions
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1
src/CMakeLists.txt
View file

@ -1138,7 +1138,6 @@ add_executable( zdoom WIN32 MACOSX_BUNDLE
timidity/timidity.cpp
wildmidi/file_io.cpp
wildmidi/gus_pat.cpp
wildmidi/lock.cpp
wildmidi/reverb.cpp
wildmidi/wildmidi_lib.cpp
wildmidi/wm_error.cpp

86
src/wildmidi/lock.cpp
View file

@ -1,86 +0,0 @@
/*
lock.c - data locking code for lib
Copyright (C) Chris Ison 2001-2011
Copyright (C) Bret Curtis 2013-2014
This file is part of WildMIDI.
WildMIDI is free software: you can redistribute and/or modify the player
under the terms of the GNU General Public License and you can redistribute
and/or modify the library under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, either version 3 of
the licenses, or(at your option) any later version.
WildMIDI is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License and
the GNU Lesser General Public License for more details.
You should have received a copy of the GNU General Public License and the
GNU Lesser General Public License along with WildMIDI. If not, see
<http://www.gnu.org/licenses/>.
*/
//#include "config.h"
#ifndef __DJGPP__
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#endif
#include "lock.h"
#include "common.h"
/*
_WM_Lock(wmlock)
wmlock = a pointer to a value
returns nothing
Attempts to set a lock on the MDI tree so that
only 1 library command may access it at any time.
If lock fails the process retries until successful.
*/
void _WM_Lock(int * wmlock) {
LOCK_START:
/* Check if lock is clear, if so set it */
if (*wmlock == 0) {
(*wmlock)++;
/* Now that the lock is set, make sure we
* don't have a race condition. If so,
* decrement the lock by one and retry. */
if (*wmlock == 1) {
return; /* Lock cleanly set */
}
(*wmlock)--;
}
#ifdef _WIN32
Sleep(10);
#else
usleep(500);
#endif
goto LOCK_START;
}
/*
_WM_Unlock(wmlock)
wmlock = a pointer to a value
returns nothing
Removes a lock previously placed on the MDI tree.
*/
void _WM_Unlock(int *wmlock) {
/* We don't want a -1 lock, so just to make sure */
if ((*wmlock) != 0) {
(*wmlock)--;
}
}
#endif /* __DJGPP__ */

36
src/wildmidi/lock.h
View file

@ -1,36 +0,0 @@
/*
lock.h - data locking code for lib
Copyright (C) Chris Ison 2001-2011
Copyright (C) Bret Curtis 2013-2014
This file is part of WildMIDI.
WildMIDI is free software: you can redistribute and/or modify the player
under the terms of the GNU General Public License and you can redistribute
and/or modify the library under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, either version 3 of
the licenses, or(at your option) any later version.
WildMIDI is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License and
the GNU Lesser General Public License for more details.
You should have received a copy of the GNU General Public License and the
GNU Lesser General Public License along with WildMIDI. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifndef __LOCK_H
#define __LOCK_H
extern void _WM_Lock (int * wmlock);
extern void _WM_Unlock (int *wmlock);
#ifdef __DJGPP__
#define _WM_Lock(p) do {} while (0)
#define _WM_Unlock(p) do {} while (0)
#endif
#endif /* __LOCK_H */

96
src/wildmidi/wildmidi_lib.cpp
View file

@ -46,10 +46,10 @@
#include "common.h"
#include "wm_error.h"
#include "file_io.h"
#include "lock.h"
#include "reverb.h"
#include "gus_pat.h"
#include "wildmidi_lib.h"
#include "critsec.h"
#define IS_DIR_SEPARATOR(c) ((c) == '/' || (c) == '\\')
#ifdef _WIN32
@ -88,7 +88,7 @@ static int fix_release = 0;
static int auto_amp = 0;
static int auto_amp_with_amp = 0;
static int patch_lock;
static FCriticalSection patch_lock;
struct _channel {
unsigned char bank;
@ -149,7 +149,24 @@ struct _event_data {
};
struct _mdi {
int lock;
_mdi()
{
samples_to_mix = 0;
midi_master_vol = 0;
memset(&info, 0, sizeof(info));
tmp_info = NULL;
memset(&channel, 0, sizeof(channel));
note = NULL;
memset(note_table, 0, sizeof(note_table));
patches = NULL;
patch_count = 0;
amp = 0;
mix_buffer = NULL;
mix_buffer_size = NULL;
reverb = NULL;
}
FCriticalSection lock;
unsigned long int samples_to_mix;
unsigned short midi_master_vol;
@ -177,7 +194,7 @@ static double newt_coeffs[58][58]; /* for start/end of samples */
#define MAX_GAUSS_ORDER 34 /* 34 is as high as we can go before errors crop up */
static double *gauss_table = NULL; /* *gauss_table[1<<FPBITS] */
static int gauss_n = MAX_GAUSS_ORDER;
static int gauss_lock;
static FCriticalSection gauss_lock;
static void init_gauss(void) {
/* init gauss table */
@ -190,9 +207,9 @@ static void init_gauss(void) {
double z[35];
double *gptr, *t;
_WM_Lock(&gauss_lock);
gauss_lock.Enter();
if (gauss_table) {
_WM_Unlock(&gauss_lock);
gauss_lock.Leave();
return;
}
@ -239,14 +256,14 @@ static void init_gauss(void) {
}
gauss_table = t;
_WM_Unlock(&gauss_lock);
gauss_lock.Leave();
}
static void free_gauss(void) {
_WM_Lock(&gauss_lock);
gauss_lock.Enter();
free(gauss_table);
gauss_table = NULL;
_WM_Unlock(&gauss_lock);
gauss_lock.Leave();
}
struct _hndl {
@ -520,7 +537,7 @@ static void WM_FreePatches(void) {
struct _patch * tmp_patch;
struct _sample * tmp_sample;
_WM_Lock(&patch_lock);
patch_lock.Enter();
for (i = 0; i < 128; i++) {
while (patch[i]) {
while (patch[i]->first_sample) {
@ -535,7 +552,7 @@ static void WM_FreePatches(void) {
patch[i] = tmp_patch;
}
}
_WM_Unlock(&patch_lock);
patch_lock.Leave();
}
/* wm_strdup -- adds extra space for appending up to 4 chars */
@ -1273,27 +1290,27 @@ static struct _patch *
get_patch_data(unsigned short patchid) {
struct _patch *search_patch;
_WM_Lock(&patch_lock);
patch_lock.Enter();
search_patch = patch[patchid & 0x007F];
if (search_patch == NULL) {
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return NULL;
}
while (search_patch) {
if (search_patch->patchid == patchid) {
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return search_patch;
}
search_patch = search_patch->next;
}
if ((patchid >> 8) != 0) {
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return (get_patch_data(patchid & 0x00FF));
}
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return NULL;
}
@ -1312,16 +1329,16 @@ static void load_patch(struct _mdi *mdi, unsigned short patchid) {
return;
}
_WM_Lock(&patch_lock);
patch_lock.Enter();
if (!tmp_patch->loaded) {
if (load_sample(tmp_patch) == -1) {
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return;
}
}
if (tmp_patch->first_sample == NULL) {
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return;
}
@ -1330,7 +1347,7 @@ static void load_patch(struct _mdi *mdi, unsigned short patchid) {
(sizeof(struct _patch*) * mdi->patch_count));
mdi->patches[mdi->patch_count - 1] = tmp_patch;
tmp_patch->inuse_count++;
_WM_Unlock(&patch_lock);
patch_lock.Leave();
}
static struct _sample *
@ -1338,17 +1355,17 @@ get_sample_data(struct _patch *sample_patch, unsigned long int freq) {
struct _sample *last_sample = NULL;
struct _sample *return_sample = NULL;
_WM_Lock(&patch_lock);
patch_lock.Enter();
if (sample_patch == NULL) {
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return NULL;
}
if (sample_patch->first_sample == NULL) {
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return NULL;
}
if (freq == 0) {
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return sample_patch->first_sample;
}
@ -1357,7 +1374,7 @@ get_sample_data(struct _patch *sample_patch, unsigned long int freq) {
while (last_sample) {
if (freq > last_sample->freq_low) {
if (freq < last_sample->freq_high) {
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return last_sample;
} else {
return_sample = last_sample;
@ -1365,7 +1382,7 @@ get_sample_data(struct _patch *sample_patch, unsigned long int freq) {
}
last_sample = last_sample->next;
}
_WM_Unlock(&patch_lock);
patch_lock.Leave();
return return_sample;
}
@ -2021,8 +2038,7 @@ static struct _mdi *
Init_MDI(void) {
struct _mdi *mdi;
mdi = (struct _mdi*)malloc(sizeof(struct _mdi));
memset(mdi, 0, (sizeof(struct _mdi)));
mdi = new _mdi;
mdi->info.copyright = NULL;
mdi->info.mixer_options = WM_MixerOptions;
@ -2044,7 +2060,7 @@ static void freeMDI(struct _mdi *mdi) {
unsigned long int i;
if (mdi->patch_count != 0) {
_WM_Lock(&patch_lock);
patch_lock.Enter();
for (i = 0; i < mdi->patch_count; i++) {
mdi->patches[i]->inuse_count--;
if (mdi->patches[i]->inuse_count == 0) {
@ -2058,7 +2074,7 @@ static void freeMDI(struct _mdi *mdi) {
mdi->patches[i]->loaded = 0;
}
}
_WM_Unlock(&patch_lock);
patch_lock.Leave();
free(mdi->patches);
}
@ -2554,7 +2570,6 @@ int *WM_Mix(midi *handle, int *buffer, unsigned long count)
}
}
/*
* =========================
* External Functions
@ -2602,9 +2617,6 @@ WM_SYMBOL int WildMidi_Init(const char * config_file, unsigned short int rate,
return -1;
}
_WM_SampleRate = rate;
gauss_lock = 0;
patch_lock = 0;
WM_Initialized = 1;
return 0;
@ -2663,7 +2675,7 @@ WM_SYMBOL int WildMidi_Close(midi * handle) {
0);
return -1;
}
_WM_Lock(&mdi->lock);
mdi->lock.Enter();
if (first_handle->handle == handle) {
tmp_handle = first_handle->next;
free(first_handle);
@ -2725,17 +2737,17 @@ WM_SYMBOL int WildMidi_SetOption(midi * handle, unsigned short int options,
}
mdi = (struct _mdi *) handle;
_WM_Lock(&mdi->lock);
mdi->lock.Enter();
if ((!(options & 0x0007)) || (options & 0xFFF8)) {
_WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_INVALID_ARG, "(invalid option)",
0);
_WM_Unlock(&mdi->lock);
mdi->lock.Leave();
return -1;
}
if (setting & 0xFFF8) {
_WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_INVALID_ARG,
"(invalid setting)", 0);
_WM_Unlock(&mdi->lock);
mdi->lock.Leave();
return -1;
}
@ -2763,7 +2775,7 @@ WM_SYMBOL int WildMidi_SetOption(midi * handle, unsigned short int options,
_WM_reset_reverb(mdi->reverb);
}
_WM_Unlock(&mdi->lock);
mdi->lock.Leave();
return 0;
}
@ -2779,12 +2791,12 @@ WildMidi_GetInfo(midi * handle) {
0);
return NULL;
}
_WM_Lock(&mdi->lock);
mdi->lock.Enter();
if (mdi->tmp_info == NULL) {
mdi->tmp_info = (struct _WM_Info*)malloc(sizeof(struct _WM_Info));
if (mdi->tmp_info == NULL) {
_WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_MEM, "to set info", 0);
_WM_Unlock(&mdi->lock);
mdi->lock.Leave();
return NULL;
}
mdi->tmp_info->copyright = NULL;
@ -2799,7 +2811,7 @@ WildMidi_GetInfo(midi * handle) {
} else {
mdi->tmp_info->copyright = NULL;
}
_WM_Unlock(&mdi->lock);
mdi->lock.Leave();
return mdi->tmp_info;
}

8
zdoom.vcproj
View file

@ -2819,10 +2819,6 @@
RelativePath=".\src\wildmidi\gus_pat.h"
>
</File>
<File
RelativePath=".\src\wildmidi\lock.h"
>
</File>
<File
RelativePath=".\src\wildmidi\reverb.h"
>
@ -2847,10 +2843,6 @@
RelativePath=".\src\wildmidi\gus_pat.cpp"
>
</File>
<File
RelativePath=".\src\wildmidi\lock.cpp"
>
</File>
<File
RelativePath=".\src\wildmidi\reverb.cpp"
>