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Fixed pcm_plug race condition

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This commit is contained in:
Abramo Bagnara 2001-01-22 16:07:11 +00:00
parent 5c84940c1f
commit c6f6c231c0
4 changed files with 73 additions and 52 deletions
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57
src/pcm/pcm_params.c
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@ -25,53 +25,6 @@
#include "interval.h"
#include "mask.h"
static void approx_sub(int a, int adir,
int b, int bdir,
int *c, int *cdir)
{
adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
*c = a - b;
*cdir = adir - bdir;
if (*cdir == -2) {
assert(*c > INT_MIN);
(*c)--;
} else if (*cdir == 2) {
assert(*c < INT_MAX);
(*c)++;
}
}
static int approx_lt(unsigned int a, int adir,
unsigned int b, int bdir)
{
assert(a > 0 || adir >= 0);
assert(b > 0 || bdir >= 0);
if (adir < 0) {
a--;
adir = 1;
} else if (adir > 0)
adir = 1;
if (bdir < 0) {
b--;
bdir = 1;
} else if (bdir > 0)
bdir = 1;
return a < b || (a == b && adir < bdir);
}
/* Return 1 if min is nearer to best than max */
static int approx_nearer(int min, int mindir,
int best, int bestdir,
int max, int maxdir)
{
int dmin, dmindir;
int dmax, dmaxdir;
approx_sub(best, bestdir, min, mindir, &dmin, &dmindir);
approx_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
return approx_lt(dmin, dmindir, dmax, dmaxdir);
}
static inline int hw_is_mask(int var)
{
return var >= SND_PCM_HW_PARAM_FIRST_MASK &&
@ -771,7 +724,7 @@ int snd_pcm_hw_param_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
max = snd_pcm_hw_param_max(pcm, &params1, var, max, &maxdir);
if (max < 0)
goto _end;
if (approx_nearer(max, maxdir, best, valdir, min, mindir)) {
if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
*params = params1;
last = 1;
}
@ -813,7 +766,7 @@ int snd_pcm_hw_param_next(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
/* FIXME */
if (best > INT_MAX)
best = INT_MAX;
approx_sub(val, valdir, best, bestdir, &diff, &diffdir);
boundary_sub(val, valdir, best, bestdir, &diff, &diffdir);
if (diff < 0 || (diff == 0 && diffdir < 0)) {
min = best - diff;
mindir = bestdir - diffdir;
@ -839,7 +792,7 @@ int snd_pcm_hw_param_next(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
max = snd_pcm_hw_param_max(pcm, &params1, var, max, &maxdir);
if (max < 0)
goto _end;
if (approx_nearer(max, maxdir, best, bestdir, min, mindir)) {
if (boundary_nearer(max, maxdir, best, bestdir, min, mindir)) {
*params = params1;
last = 1;
}
@ -869,13 +822,13 @@ void snd_pcm_hw_param_near_minmax(snd_pcm_t *pcm,
{
snd_pcm_hw_params_t tmp;
int err;
if (!approx_lt(min, *mindir, max, *maxdir)) {
if (!boundary_lt(min, *mindir, max, *maxdir)) {
snd_pcm_hw_param_near(pcm, params, var, min, mindir);
return;
}
tmp = *params;
min = snd_pcm_hw_param_near(pcm, &tmp, var, min, mindir);
if (approx_lt(min, *mindir, max, *maxdir)) {
if (boundary_lt(min, *mindir, max, *maxdir)) {
tmp = *params;
max = snd_pcm_hw_param_near(pcm, &tmp, var, max, maxdir);
} else {