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dix: preparation change: make runtime exchange of filter chain safe

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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Simon Thum 2008-07-23 12:03:17 +02:00 committed by Peter Hutterer
parent 1a9f9ac50f
commit a17cb29f5a
1 changed files with 7 additions and 1 deletions
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8
dix/ptrveloc.c
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@ -30,6 +30,7 @@
#include <ptrveloc.h>
#include <inputstr.h>
#include <assert.h>
#include <os.h>
/*****************************************************************************
* Predictable pointer ballistics
@ -151,6 +152,8 @@ InitFilterChain(DeviceVelocityPtr s, float rdecay, float progression, int stages
ErrorF("(dix ptracc) invalid filter chain progression specified\n");
return;
}
/* Block here to support runtime filter adjustment */
OsBlockSignals();
for(fn = 0; fn < MAX_VELOCITY_FILTERS; fn++){
if(fn < stages){
InitFilterStage(&s->filters[fn], rdecay, lutsize);
@ -159,6 +162,10 @@ InitFilterChain(DeviceVelocityPtr s, float rdecay, float progression, int stages
}
rdecay /= progression;
}
/* release again. Should the input loop be threaded, we also need
* memory release here (in princliple).
*/
OsReleaseSignals();
}
@ -199,7 +206,6 @@ InitFilterStage(FilterStagePtr s, float rdecay, int lutsize)
float *oldlut;
s->fading_lut_size = 0; /* prevent access */
/* mb(); concurrency issues may arise */
if(lutsize > 0){
newlut = xalloc (sizeof(float)* lutsize);