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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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54
src/pcm/interval.c
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@ -381,3 +381,57 @@ void interval_print(const interval_t *i, snd_output_t *out)
i->min, i->max,
i->openmax ? ')' : ']');
}
void boundary_abs(int a, int adir, int *b, int *bdir)
{
if (a < 0 || (a == 0 && adir < 0)) {
*b = -a;
*bdir = -adir;
} else {
*b = a;
*bdir = adir;
}
}
void boundary_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)++;
}
}
int boundary_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 */
int boundary_nearer(int min, int mindir, int best, int bestdir, int max, int maxdir)
{
int dmin, dmindir;
int dmax, dmaxdir;
boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
return boundary_lt(dmin, dmindir, dmax, dmaxdir);
}