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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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10
src/dsp/upsampling.c
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@@ -173,7 +173,11 @@ WebPYUV444Converter WebPYUV444Converters[MODE_LAST];
extern WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersMIPSdspR2(void);
static volatile VP8CPUInfo last_cpuinfo_used1 = (VP8CPUInfo)&last_cpuinfo_used1;
WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444Converters(void) {
if (last_cpuinfo_used1 == VP8GetCPUInfo) return;
WebPYUV444Converters[MODE_RGB] = Yuv444ToRgb;
WebPYUV444Converters[MODE_RGBA] = Yuv444ToRgba;
WebPYUV444Converters[MODE_BGR] = Yuv444ToBgr;
@@ -193,6 +197,7 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444Converters(void) {
}
#endif
}
last_cpuinfo_used1 = VP8GetCPUInfo;
}
//------------------------------------------------------------------------------
@@ -202,7 +207,11 @@ extern WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersSSE2(void);
extern WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersNEON(void);
extern WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersMIPSdspR2(void);
static volatile VP8CPUInfo last_cpuinfo_used2 = (VP8CPUInfo)&last_cpuinfo_used2;
WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplers(void) {
if (last_cpuinfo_used2 == VP8GetCPUInfo) return;
#ifdef FANCY_UPSAMPLING
WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair;
WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair;
@@ -235,6 +244,7 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplers(void) {
#endif
}
#endif // FANCY_UPSAMPLING
last_cpuinfo_used2 = VP8GetCPUInfo;
}
//------------------------------------------------------------------------------