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multi-thread fix: lock each entry points with a static var

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we compare the current VP8GetCPUInfo pointer to the last used.
This is less code overall and each implementation is still
testable separately (by just changing VP8GetCPUInfo, but not
a separate threads!)

Change-Id: Ia13fa8ffc4561a884508f6ab71ed0d1b9f1ce59b
This commit is contained in:
Pascal Massimino
2015-01-05 06:51:54 -08:00
parent 4e2589ff81
commit a437694a17
7 changed files with 40 additions and 1 deletions
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5
src/dsp/alpha_processing.c
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@@ -347,7 +347,11 @@ extern void VP8FiltersInitMIPSdspR2(void);
extern void WebPInitAlphaProcessingMIPSdspR2(void);
extern void WebPInitAlphaProcessingSSE2(void);
static volatile VP8CPUInfo last_cpuinfo_used = (VP8CPUInfo)&last_cpuinfo_used;
WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessing(void) {
if (last_cpuinfo_used == VP8GetCPUInfo) return;
WebPMultARGBRow = WebPMultARGBRowC;
WebPMultRow = WebPMultRowC;
WebPApplyAlphaMultiply = ApplyAlphaMultiply;
@@ -370,4 +374,5 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessing(void) {
}
#endif
}
last_cpuinfo_used = VP8GetCPUInfo;
}