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cgo
[ DIR ]
drwxr-xr-x
debug
[ DIR ]
drwxr-xr-x
internal
[ DIR ]
drwxr-xr-x
msan
[ DIR ]
drwxr-xr-x
pprof
[ DIR ]
drwxr-xr-x
race
[ DIR ]
drwxr-xr-x
testdata
[ DIR ]
drwxr-xr-x
trace
[ DIR ]
drwxr-xr-x
HACKING.md
13.07
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Makefile
178
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-rw-r--r--
alg.go
10.18
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asm.s
1.16
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asm_386.s
40.2
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asm_amd64.s
45.78
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asm_arm.s
30.89
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asm_arm64.s
33.12
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asm_mips64x.s
22.45
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asm_mipsx.s
24.72
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asm_ppc64x.h
1023
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asm_ppc64x.s
29.39
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asm_riscv64.s
17.38
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asm_s390x.s
26.35
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asm_wasm.s
9.65
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atomic_arm64.s
259
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atomic_mips64x.s
296
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atomic_mipsx.s
258
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atomic_pointer.go
2.62
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atomic_ppc64x.s
433
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atomic_riscv64.s
307
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auxv_none.go
358
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callers_test.go
7.7
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cgo.go
2.01
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cgo_mmap.go
2.38
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cgo_ppc64x.go
411
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cgo_sigaction.go
3.09
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cgocall.go
21.38
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cgocallback.go
317
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cgocheck.go
6.8
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chan.go
19.71
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chan_test.go
21.27
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chanbarrier_test.go
1.4
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checkptr.go
2.5
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checkptr_test.go
1.27
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closure_test.go
936
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compiler.go
413
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complex.go
1.59
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complex_test.go
1.05
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cpuflags.go
740
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cpuflags_amd64.go
533
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cpuprof.go
6.65
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cputicks.go
478
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crash_cgo_test.go
13.71
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crash_nonunix_test.go
385
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crash_test.go
20.24
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crash_unix_test.go
8.89
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debug.go
1.63
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debug_test.go
6.16
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debugcall.go
2.83
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debuglog.go
17.08
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debuglog_off.go
356
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debuglog_on.go
1.09
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debuglog_test.go
4.56
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defer_test.go
9.98
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defs1_linux.go
844
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defs1_netbsd_386.go
2.84
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defs1_netbsd_amd64.go
3.07
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defs1_netbsd_arm.go
2.96
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defs1_netbsd_arm64.go
3.18
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defs1_solaris_amd64.go
4.02
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defs2_linux.go
3.51
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defs3_linux.go
1.09
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defs_aix.go
4.16
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defs_aix_ppc64.go
3.61
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defs_arm_linux.go
2.67
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defs_darwin.go
3.84
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defs_darwin_386.go
5.98
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defs_darwin_amd64.go
6.07
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defs_darwin_arm.go
3.78
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defs_darwin_arm64.go
3.84
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defs_dragonfly.go
2.54
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defs_dragonfly_amd64.go
3.25
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defs_freebsd.go
3.84
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defs_freebsd_386.go
4.35
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defs_freebsd_amd64.go
4.62
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defs_freebsd_arm.go
3.68
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defs_freebsd_arm64.go
4
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defs_illumos_amd64.go
285
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defs_linux.go
3.04
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defs_linux_386.go
4.05
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defs_linux_amd64.go
4.56
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defs_linux_arm.go
3.31
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defs_linux_arm64.go
3.23
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defs_linux_mips64x.go
3.04
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defs_linux_mipsx.go
3.18
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defs_linux_ppc64.go
3.28
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defs_linux_ppc64le.go
3.28
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defs_linux_riscv64.go
3.27
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defs_linux_s390x.go
2.76
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defs_netbsd.go
2.74
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defs_netbsd_386.go
854
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defs_netbsd_amd64.go
1.01
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defs_netbsd_arm.go
763
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defs_openbsd.go
2.6
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defs_openbsd_386.go
2.63
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defs_openbsd_amd64.go
2.83
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defs_openbsd_arm.go
2.74
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defs_openbsd_arm64.go
2.34
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defs_plan9_386.go
1.47
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defs_plan9_amd64.go
1.66
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defs_plan9_arm.go
1.73
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defs_solaris.go
3.33
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defs_solaris_amd64.go
1003
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defs_windows.go
2.07
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defs_windows_386.go
3.75
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defs_windows_amd64.go
4.51
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defs_windows_arm.go
3.59
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duff_386.s
8.24
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duff_amd64.s
5.53
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duff_arm.s
7.11
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duff_arm64.s
5.25
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duff_mips64x.s
11.28
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duff_ppc64x.s
2.45
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duff_s390x.s
507
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env_plan9.go
855
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env_posix.go
1.82
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env_test.go
1.28
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error.go
7.26
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example_test.go
1.34
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export_aix_test.go
204
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export_arm_test.go
226
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export_darwin_test.go
351
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export_debug_test.go
5.28
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export_debuglog_test.go
1.27
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export_futex_test.go
529
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export_linux_test.go
429
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export_mmap_test.go
481
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export_solaris_test.go
282
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export_test.go
23.58
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export_unix_test.go
2.28
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export_windows_test.go
652
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extern.go
11.6
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fastlog2.go
1.22
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fastlog2_test.go
784
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fastlog2table.go
904
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float.go
1.35
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funcdata.h
2.44
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futex_test.go
2.1
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gc_test.go
13.22
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gcinfo_test.go
6.18
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go_tls.h
366
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hash32.go
2.51
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hash64.go
2.6
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hash_test.go
17.54
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heapdump.go
17.1
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iface.go
15.78
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iface_test.go
6.81
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lfstack.go
1.77
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lfstack_32bit.go
522
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lfstack_64bit.go
2.15
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lfstack_test.go
2.78
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libfuzzer.go
2.58
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libfuzzer_amd64.s
940
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libfuzzer_arm64.s
751
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lock_futex.go
5.06
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lock_js.go
5.45
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lock_sema.go
6.6
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malloc.go
48.32
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malloc_test.go
9.37
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map.go
42.13
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map_benchmark_test.go
10.16
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map_fast32.go
12.18
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map_fast64.go
12.37
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map_faststr.go
13.82
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map_test.go
27.11
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mbarrier.go
12.14
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mbitmap.go
67.53
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mcache.go
5.61
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mcentral.go
7.14
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mem_aix.go
1.93
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mem_bsd.go
2.05
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mem_darwin.go
1.88
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mem_js.go
2.32
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mem_linux.go
5.58
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mem_plan9.go
4.53
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mem_windows.go
3.86
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memclr_386.s
2.4
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memclr_amd64.s
3.65
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memclr_arm.s
2.44
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memclr_arm64.s
3.48
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memclr_mips64x.s
785
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memclr_mipsx.s
1.24
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memclr_plan9_386.s
905
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memclr_plan9_amd64.s
433
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memclr_ppc64x.s
4.2
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memclr_riscv64.s
848
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memclr_s390x.s
1.89
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memclr_wasm.s
544
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memmove_386.s
4.45
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memmove_amd64.s
12.33
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memmove_arm.s
5.9
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memmove_arm64.s
3.56
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memmove_linux_amd64_test.go
1.61
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memmove_mips64x.s
1.82
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memmove_mipsx.s
4.39
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memmove_plan9_386.s
3.06
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memmove_plan9_amd64.s
3.04
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memmove_ppc64x.s
3.33
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memmove_riscv64.s
1.81
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memmove_s390x.s
2.92
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memmove_test.go
10.97
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memmove_wasm.s
1.74
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mfinal.go
14.8
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mfinal_test.go
5.85
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mfixalloc.go
2.72
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mgc.go
74.87
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mgcmark.go
46.5
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mgcscavenge.go
30.95
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mgcscavenge_test.go
12.34
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mgcstack.go
10.55
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mgcsweep.go
14.79
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mgcsweepbuf.go
5.98
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mgcwork.go
14.24
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mheap.go
61.5
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mkduff.go
6.23
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mkfastlog2table.go
1.32
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mkpreempt.go
13.33
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mksizeclasses.go
8.62
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mmap.go
847
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mpagealloc.go
35.25
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mpagealloc_32bit.go
3.75
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mpagealloc_64bit.go
6.51
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mpagealloc_test.go
28.88
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mpagecache.go
5.03
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mpagecache_test.go
9.93
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mpallocbits.go
10.69
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mpallocbits_test.go
12.93
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mprof.go
24.06
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mranges.go
5.41
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msan.go
1.39
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msan0.go
647
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msan_amd64.s
2.03
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msan_arm64.s
1.69
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msize.go
785
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mstats.go
22.62
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mwbbuf.go
10.07
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nbpipe_fcntl_libc_test.go
463
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nbpipe_fcntl_unix_test.go
445
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nbpipe_pipe.go
411
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nbpipe_pipe2.go
509
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nbpipe_test.go
2.17
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net_plan9.go
645
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netpoll.go
14.46
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netpoll_aix.go
4.64
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netpoll_epoll.go
4
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netpoll_fake.go
648
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netpoll_kqueue.go
4.39
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netpoll_solaris.go
10.56
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netpoll_stub.go
1.3
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netpoll_windows.go
4.51
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norace_linux_test.go
888
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norace_test.go
979
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numcpu_freebsd_test.go
381
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os2_aix.go
20.67
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os2_freebsd.go
302
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os2_openbsd.go
296
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os2_plan9.go
1.48
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os2_solaris.go
320
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os3_plan9.go
3.99
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os3_solaris.go
16.92
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os_aix.go
8.29
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os_android.go
463
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os_darwin.go
10.59
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os_darwin_arm.go
749
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os_darwin_arm64.go
416
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os_dragonfly.go
6.2
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os_freebsd.go
10.97
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os_freebsd2.go
478
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os_freebsd_amd64.go
529
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os_freebsd_arm.go
1.32
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os_freebsd_arm64.go
2.97
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os_freebsd_noauxv.go
254
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os_illumos.go
3.93
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os_js.go
2.93
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os_linux.go
13.16
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os_linux_arm.go
1.35
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os_linux_arm64.go
1.02
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os_linux_be64.go
816
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os_linux_generic.go
916
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os_linux_mips64x.go
999
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os_linux_mipsx.go
1.05
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os_linux_noauxv.go
307
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os_linux_novdso.go
298
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os_linux_ppc64x.go
527
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os_linux_riscv64.go
198
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os_linux_s390x.go
455
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os_linux_x86.go
2.69
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os_netbsd.go
8.49
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os_netbsd_386.go
588
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os_netbsd_amd64.go
585
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os_netbsd_arm.go
1.13
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os_netbsd_arm64.go
827
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os_nonopenbsd.go
436
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os_only_solaris.go
356
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os_openbsd.go
7.81
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os_openbsd_arm.go
749
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os_openbsd_arm64.go
714
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os_plan9.go
9.3
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os_plan9_arm.go
462
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os_solaris.go
6.49
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os_windows.go
37.01
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os_windows_arm.go
511
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panic.go
42.23
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panic32.go
4.79
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plugin.go
4.16
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Code Editor : select.go
// Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package runtime // This file contains the implementation of Go select statements. import ( "unsafe" ) const debugSelect = false // scase.kind values. // Known to compiler. // Changes here must also be made in src/cmd/compile/internal/gc/select.go's walkselectcases. const ( caseNil = iota caseRecv caseSend caseDefault ) // Select case descriptor. // Known to compiler. // Changes here must also be made in src/cmd/internal/gc/select.go's scasetype. type scase struct { c *hchan // chan elem unsafe.Pointer // data element kind uint16 pc uintptr // race pc (for race detector / msan) releasetime int64 } var ( chansendpc = funcPC(chansend) chanrecvpc = funcPC(chanrecv) ) func selectsetpc(cas *scase) { cas.pc = getcallerpc() } func sellock(scases []scase, lockorder []uint16) { var c *hchan for _, o := range lockorder { c0 := scases[o].c if c0 != nil && c0 != c { c = c0 lock(&c.lock) } } } func selunlock(scases []scase, lockorder []uint16) { // We must be very careful here to not touch sel after we have unlocked // the last lock, because sel can be freed right after the last unlock. // Consider the following situation. // First M calls runtime·park() in runtime·selectgo() passing the sel. // Once runtime·park() has unlocked the last lock, another M makes // the G that calls select runnable again and schedules it for execution. // When the G runs on another M, it locks all the locks and frees sel. // Now if the first M touches sel, it will access freed memory. for i := len(scases) - 1; i >= 0; i-- { c := scases[lockorder[i]].c if c == nil { break } if i > 0 && c == scases[lockorder[i-1]].c { continue // will unlock it on the next iteration } unlock(&c.lock) } } func selparkcommit(gp *g, _ unsafe.Pointer) bool { // There are unlocked sudogs that point into gp's stack. Stack // copying must lock the channels of those sudogs. gp.activeStackChans = true // This must not access gp's stack (see gopark). In // particular, it must not access the *hselect. That's okay, // because by the time this is called, gp.waiting has all // channels in lock order. var lastc *hchan for sg := gp.waiting; sg != nil; sg = sg.waitlink { if sg.c != lastc && lastc != nil { // As soon as we unlock the channel, fields in // any sudog with that channel may change, // including c and waitlink. Since multiple // sudogs may have the same channel, we unlock // only after we've passed the last instance // of a channel. unlock(&lastc.lock) } lastc = sg.c } if lastc != nil { unlock(&lastc.lock) } return true } func block() { gopark(nil, nil, waitReasonSelectNoCases, traceEvGoStop, 1) // forever } // selectgo implements the select statement. // // cas0 points to an array of type [ncases]scase, and order0 points to // an array of type [2*ncases]uint16. Both reside on the goroutine's // stack (regardless of any escaping in selectgo). // // selectgo returns the index of the chosen scase, which matches the // ordinal position of its respective select{recv,send,default} call. // Also, if the chosen scase was a receive operation, it reports whether // a value was received. func selectgo(cas0 *scase, order0 *uint16, ncases int) (int, bool) { if debugSelect { print("select: cas0=", cas0, "\n") } cas1 := (*[1 << 16]scase)(unsafe.Pointer(cas0)) order1 := (*[1 << 17]uint16)(unsafe.Pointer(order0)) scases := cas1[:ncases:ncases] pollorder := order1[:ncases:ncases] lockorder := order1[ncases:][:ncases:ncases] // Replace send/receive cases involving nil channels with // caseNil so logic below can assume non-nil channel. for i := range scases { cas := &scases[i] if cas.c == nil && cas.kind != caseDefault { *cas = scase{} } } var t0 int64 if blockprofilerate > 0 { t0 = cputicks() for i := 0; i < ncases; i++ { scases[i].releasetime = -1 } } // The compiler rewrites selects that statically have // only 0 or 1 cases plus default into simpler constructs. // The only way we can end up with such small sel.ncase // values here is for a larger select in which most channels // have been nilled out. The general code handles those // cases correctly, and they are rare enough not to bother // optimizing (and needing to test). // generate permuted order for i := 1; i < ncases; i++ { j := fastrandn(uint32(i + 1)) pollorder[i] = pollorder[j] pollorder[j] = uint16(i) } // sort the cases by Hchan address to get the locking order. // simple heap sort, to guarantee n log n time and constant stack footprint. for i := 0; i < ncases; i++ { j := i // Start with the pollorder to permute cases on the same channel. c := scases[pollorder[i]].c for j > 0 && scases[lockorder[(j-1)/2]].c.sortkey() < c.sortkey() { k := (j - 1) / 2 lockorder[j] = lockorder[k] j = k } lockorder[j] = pollorder[i] } for i := ncases - 1; i >= 0; i-- { o := lockorder[i] c := scases[o].c lockorder[i] = lockorder[0] j := 0 for { k := j*2 + 1 if k >= i { break } if k+1 < i && scases[lockorder[k]].c.sortkey() < scases[lockorder[k+1]].c.sortkey() { k++ } if c.sortkey() < scases[lockorder[k]].c.sortkey() { lockorder[j] = lockorder[k] j = k continue } break } lockorder[j] = o } if debugSelect { for i := 0; i+1 < ncases; i++ { if scases[lockorder[i]].c.sortkey() > scases[lockorder[i+1]].c.sortkey() { print("i=", i, " x=", lockorder[i], " y=", lockorder[i+1], "\n") throw("select: broken sort") } } } // lock all the channels involved in the select sellock(scases, lockorder) var ( gp *g sg *sudog c *hchan k *scase sglist *sudog sgnext *sudog qp unsafe.Pointer nextp **sudog ) loop: // pass 1 - look for something already waiting var dfli int var dfl *scase var casi int var cas *scase var recvOK bool for i := 0; i < ncases; i++ { casi = int(pollorder[i]) cas = &scases[casi] c = cas.c switch cas.kind { case caseNil: continue case caseRecv: sg = c.sendq.dequeue() if sg != nil { goto recv } if c.qcount > 0 { goto bufrecv } if c.closed != 0 { goto rclose } case caseSend: if raceenabled { racereadpc(c.raceaddr(), cas.pc, chansendpc) } if c.closed != 0 { goto sclose } sg = c.recvq.dequeue() if sg != nil { goto send } if c.qcount < c.dataqsiz { goto bufsend } case caseDefault: dfli = casi dfl = cas } } if dfl != nil { selunlock(scases, lockorder) casi = dfli cas = dfl goto retc } // pass 2 - enqueue on all chans gp = getg() if gp.waiting != nil { throw("gp.waiting != nil") } nextp = &gp.waiting for _, casei := range lockorder { casi = int(casei) cas = &scases[casi] if cas.kind == caseNil { continue } c = cas.c sg := acquireSudog() sg.g = gp sg.isSelect = true // No stack splits between assigning elem and enqueuing // sg on gp.waiting where copystack can find it. sg.elem = cas.elem sg.releasetime = 0 if t0 != 0 { sg.releasetime = -1 } sg.c = c // Construct waiting list in lock order. *nextp = sg nextp = &sg.waitlink switch cas.kind { case caseRecv: c.recvq.enqueue(sg) case caseSend: c.sendq.enqueue(sg) } } // wait for someone to wake us up gp.param = nil gopark(selparkcommit, nil, waitReasonSelect, traceEvGoBlockSelect, 1) gp.activeStackChans = false sellock(scases, lockorder) gp.selectDone = 0 sg = (*sudog)(gp.param) gp.param = nil // pass 3 - dequeue from unsuccessful chans // otherwise they stack up on quiet channels // record the successful case, if any. // We singly-linked up the SudoGs in lock order. casi = -1 cas = nil sglist = gp.waiting // Clear all elem before unlinking from gp.waiting. for sg1 := gp.waiting; sg1 != nil; sg1 = sg1.waitlink { sg1.isSelect = false sg1.elem = nil sg1.c = nil } gp.waiting = nil for _, casei := range lockorder { k = &scases[casei] if k.kind == caseNil { continue } if sglist.releasetime > 0 { k.releasetime = sglist.releasetime } if sg == sglist { // sg has already been dequeued by the G that woke us up. casi = int(casei) cas = k } else { c = k.c if k.kind == caseSend { c.sendq.dequeueSudoG(sglist) } else { c.recvq.dequeueSudoG(sglist) } } sgnext = sglist.waitlink sglist.waitlink = nil releaseSudog(sglist) sglist = sgnext } if cas == nil { // We can wake up with gp.param == nil (so cas == nil) // when a channel involved in the select has been closed. // It is easiest to loop and re-run the operation; // we'll see that it's now closed. // Maybe some day we can signal the close explicitly, // but we'd have to distinguish close-on-reader from close-on-writer. // It's easiest not to duplicate the code and just recheck above. // We know that something closed, and things never un-close, // so we won't block again. goto loop } c = cas.c if debugSelect { print("wait-return: cas0=", cas0, " c=", c, " cas=", cas, " kind=", cas.kind, "\n") } if cas.kind == caseRecv { recvOK = true } if raceenabled { if cas.kind == caseRecv && cas.elem != nil { raceWriteObjectPC(c.elemtype, cas.elem, cas.pc, chanrecvpc) } else if cas.kind == caseSend { raceReadObjectPC(c.elemtype, cas.elem, cas.pc, chansendpc) } } if msanenabled { if cas.kind == caseRecv && cas.elem != nil { msanwrite(cas.elem, c.elemtype.size) } else if cas.kind == caseSend { msanread(cas.elem, c.elemtype.size) } } selunlock(scases, lockorder) goto retc bufrecv: // can receive from buffer if raceenabled { if cas.elem != nil { raceWriteObjectPC(c.elemtype, cas.elem, cas.pc, chanrecvpc) } raceacquire(chanbuf(c, c.recvx)) racerelease(chanbuf(c, c.recvx)) } if msanenabled && cas.elem != nil { msanwrite(cas.elem, c.elemtype.size) } recvOK = true qp = chanbuf(c, c.recvx) if cas.elem != nil { typedmemmove(c.elemtype, cas.elem, qp) } typedmemclr(c.elemtype, qp) c.recvx++ if c.recvx == c.dataqsiz { c.recvx = 0 } c.qcount-- selunlock(scases, lockorder) goto retc bufsend: // can send to buffer if raceenabled { raceacquire(chanbuf(c, c.sendx)) racerelease(chanbuf(c, c.sendx)) raceReadObjectPC(c.elemtype, cas.elem, cas.pc, chansendpc) } if msanenabled { msanread(cas.elem, c.elemtype.size) } typedmemmove(c.elemtype, chanbuf(c, c.sendx), cas.elem) c.sendx++ if c.sendx == c.dataqsiz { c.sendx = 0 } c.qcount++ selunlock(scases, lockorder) goto retc recv: // can receive from sleeping sender (sg) recv(c, sg, cas.elem, func() { selunlock(scases, lockorder) }, 2) if debugSelect { print("syncrecv: cas0=", cas0, " c=", c, "\n") } recvOK = true goto retc rclose: // read at end of closed channel selunlock(scases, lockorder) recvOK = false if cas.elem != nil { typedmemclr(c.elemtype, cas.elem) } if raceenabled { raceacquire(c.raceaddr()) } goto retc send: // can send to a sleeping receiver (sg) if raceenabled { raceReadObjectPC(c.elemtype, cas.elem, cas.pc, chansendpc) } if msanenabled { msanread(cas.elem, c.elemtype.size) } send(c, sg, cas.elem, func() { selunlock(scases, lockorder) }, 2) if debugSelect { print("syncsend: cas0=", cas0, " c=", c, "\n") } goto retc retc: if cas.releasetime > 0 { blockevent(cas.releasetime-t0, 1) } return casi, recvOK sclose: // send on closed channel selunlock(scases, lockorder) panic(plainError("send on closed channel")) } func (c *hchan) sortkey() uintptr { return uintptr(unsafe.Pointer(c)) } // A runtimeSelect is a single case passed to rselect. // This must match ../reflect/value.go:/runtimeSelect type runtimeSelect struct { dir selectDir typ unsafe.Pointer // channel type (not used here) ch *hchan // channel val unsafe.Pointer // ptr to data (SendDir) or ptr to receive buffer (RecvDir) } // These values must match ../reflect/value.go:/SelectDir. type selectDir int const ( _ selectDir = iota selectSend // case Chan <- Send selectRecv // case <-Chan: selectDefault // default ) //go:linkname reflect_rselect reflect.rselect func reflect_rselect(cases []runtimeSelect) (int, bool) { if len(cases) == 0 { block() } sel := make([]scase, len(cases)) order := make([]uint16, 2*len(cases)) for i := range cases { rc := &cases[i] switch rc.dir { case selectDefault: sel[i] = scase{kind: caseDefault} case selectSend: sel[i] = scase{kind: caseSend, c: rc.ch, elem: rc.val} case selectRecv: sel[i] = scase{kind: caseRecv, c: rc.ch, elem: rc.val} } if raceenabled || msanenabled { selectsetpc(&sel[i]) } } return selectgo(&sel[0], &order[0], len(cases)) } func (q *waitq) dequeueSudoG(sgp *sudog) { x := sgp.prev y := sgp.next if x != nil { if y != nil { // middle of queue x.next = y y.prev = x sgp.next = nil sgp.prev = nil return } // end of queue x.next = nil q.last = x sgp.prev = nil return } if y != nil { // start of queue y.prev = nil q.first = y sgp.next = nil return } // x==y==nil. Either sgp is the only element in the queue, // or it has already been removed. Use q.first to disambiguate. if q.first == sgp { q.first = nil q.last = nil } }
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