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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 : netpoll.go
// Copyright 2013 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. // +build aix darwin dragonfly freebsd js,wasm linux netbsd openbsd solaris windows package runtime import ( "runtime/internal/atomic" "unsafe" ) // Integrated network poller (platform-independent part). // A particular implementation (epoll/kqueue/port/AIX/Windows) // must define the following functions: // // func netpollinit() // Initialize the poller. Only called once. // // func netpollopen(fd uintptr, pd *pollDesc) int32 // Arm edge-triggered notifications for fd. The pd argument is to pass // back to netpollready when fd is ready. Return an errno value. // // func netpoll(delta int64) gList // Poll the network. If delta < 0, block indefinitely. If delta == 0, // poll without blocking. If delta > 0, block for up to delta nanoseconds. // Return a list of goroutines built by calling netpollready. // // func netpollBreak() // Wake up the network poller, assumed to be blocked in netpoll. // // func netpollIsPollDescriptor(fd uintptr) bool // Reports whether fd is a file descriptor used by the poller. // pollDesc contains 2 binary semaphores, rg and wg, to park reader and writer // goroutines respectively. The semaphore can be in the following states: // pdReady - io readiness notification is pending; // a goroutine consumes the notification by changing the state to nil. // pdWait - a goroutine prepares to park on the semaphore, but not yet parked; // the goroutine commits to park by changing the state to G pointer, // or, alternatively, concurrent io notification changes the state to READY, // or, alternatively, concurrent timeout/close changes the state to nil. // G pointer - the goroutine is blocked on the semaphore; // io notification or timeout/close changes the state to READY or nil respectively // and unparks the goroutine. // nil - nothing of the above. const ( pdReady uintptr = 1 pdWait uintptr = 2 ) const pollBlockSize = 4 * 1024 // Network poller descriptor. // // No heap pointers. // //go:notinheap type pollDesc struct { link *pollDesc // in pollcache, protected by pollcache.lock // The lock protects pollOpen, pollSetDeadline, pollUnblock and deadlineimpl operations. // This fully covers seq, rt and wt variables. fd is constant throughout the PollDesc lifetime. // pollReset, pollWait, pollWaitCanceled and runtime·netpollready (IO readiness notification) // proceed w/o taking the lock. So closing, everr, rg, rd, wg and wd are manipulated // in a lock-free way by all operations. // NOTE(dvyukov): the following code uses uintptr to store *g (rg/wg), // that will blow up when GC starts moving objects. lock mutex // protects the following fields fd uintptr closing bool everr bool // marks event scanning error happened user uint32 // user settable cookie rseq uintptr // protects from stale read timers rg uintptr // pdReady, pdWait, G waiting for read or nil rt timer // read deadline timer (set if rt.f != nil) rd int64 // read deadline wseq uintptr // protects from stale write timers wg uintptr // pdReady, pdWait, G waiting for write or nil wt timer // write deadline timer wd int64 // write deadline } type pollCache struct { lock mutex first *pollDesc // PollDesc objects must be type-stable, // because we can get ready notification from epoll/kqueue // after the descriptor is closed/reused. // Stale notifications are detected using seq variable, // seq is incremented when deadlines are changed or descriptor is reused. } var ( netpollInitLock mutex netpollInited uint32 pollcache pollCache netpollWaiters uint32 ) //go:linkname poll_runtime_pollServerInit internal/poll.runtime_pollServerInit func poll_runtime_pollServerInit() { netpollGenericInit() } func netpollGenericInit() { if atomic.Load(&netpollInited) == 0 { lock(&netpollInitLock) if netpollInited == 0 { netpollinit() atomic.Store(&netpollInited, 1) } unlock(&netpollInitLock) } } func netpollinited() bool { return atomic.Load(&netpollInited) != 0 } //go:linkname poll_runtime_isPollServerDescriptor internal/poll.runtime_isPollServerDescriptor // poll_runtime_isPollServerDescriptor reports whether fd is a // descriptor being used by netpoll. func poll_runtime_isPollServerDescriptor(fd uintptr) bool { return netpollIsPollDescriptor(fd) } //go:linkname poll_runtime_pollOpen internal/poll.runtime_pollOpen func poll_runtime_pollOpen(fd uintptr) (*pollDesc, int) { pd := pollcache.alloc() lock(&pd.lock) if pd.wg != 0 && pd.wg != pdReady { throw("runtime: blocked write on free polldesc") } if pd.rg != 0 && pd.rg != pdReady { throw("runtime: blocked read on free polldesc") } pd.fd = fd pd.closing = false pd.everr = false pd.rseq++ pd.rg = 0 pd.rd = 0 pd.wseq++ pd.wg = 0 pd.wd = 0 unlock(&pd.lock) var errno int32 errno = netpollopen(fd, pd) return pd, int(errno) } //go:linkname poll_runtime_pollClose internal/poll.runtime_pollClose func poll_runtime_pollClose(pd *pollDesc) { if !pd.closing { throw("runtime: close polldesc w/o unblock") } if pd.wg != 0 && pd.wg != pdReady { throw("runtime: blocked write on closing polldesc") } if pd.rg != 0 && pd.rg != pdReady { throw("runtime: blocked read on closing polldesc") } netpollclose(pd.fd) pollcache.free(pd) } func (c *pollCache) free(pd *pollDesc) { lock(&c.lock) pd.link = c.first c.first = pd unlock(&c.lock) } //go:linkname poll_runtime_pollReset internal/poll.runtime_pollReset func poll_runtime_pollReset(pd *pollDesc, mode int) int { err := netpollcheckerr(pd, int32(mode)) if err != 0 { return err } if mode == 'r' { pd.rg = 0 } else if mode == 'w' { pd.wg = 0 } return 0 } //go:linkname poll_runtime_pollWait internal/poll.runtime_pollWait func poll_runtime_pollWait(pd *pollDesc, mode int) int { err := netpollcheckerr(pd, int32(mode)) if err != 0 { return err } // As for now only Solaris, illumos, and AIX use level-triggered IO. if GOOS == "solaris" || GOOS == "illumos" || GOOS == "aix" { netpollarm(pd, mode) } for !netpollblock(pd, int32(mode), false) { err = netpollcheckerr(pd, int32(mode)) if err != 0 { return err } // Can happen if timeout has fired and unblocked us, // but before we had a chance to run, timeout has been reset. // Pretend it has not happened and retry. } return 0 } //go:linkname poll_runtime_pollWaitCanceled internal/poll.runtime_pollWaitCanceled func poll_runtime_pollWaitCanceled(pd *pollDesc, mode int) { // This function is used only on windows after a failed attempt to cancel // a pending async IO operation. Wait for ioready, ignore closing or timeouts. for !netpollblock(pd, int32(mode), true) { } } //go:linkname poll_runtime_pollSetDeadline internal/poll.runtime_pollSetDeadline func poll_runtime_pollSetDeadline(pd *pollDesc, d int64, mode int) { lock(&pd.lock) if pd.closing { unlock(&pd.lock) return } rd0, wd0 := pd.rd, pd.wd combo0 := rd0 > 0 && rd0 == wd0 if d > 0 { d += nanotime() if d <= 0 { // If the user has a deadline in the future, but the delay calculation // overflows, then set the deadline to the maximum possible value. d = 1<<63 - 1 } } if mode == 'r' || mode == 'r'+'w' { pd.rd = d } if mode == 'w' || mode == 'r'+'w' { pd.wd = d } combo := pd.rd > 0 && pd.rd == pd.wd rtf := netpollReadDeadline if combo { rtf = netpollDeadline } if pd.rt.f == nil { if pd.rd > 0 { pd.rt.f = rtf // Copy current seq into the timer arg. // Timer func will check the seq against current descriptor seq, // if they differ the descriptor was reused or timers were reset. pd.rt.arg = pd pd.rt.seq = pd.rseq resettimer(&pd.rt, pd.rd) } } else if pd.rd != rd0 || combo != combo0 { pd.rseq++ // invalidate current timers if pd.rd > 0 { modtimer(&pd.rt, pd.rd, 0, rtf, pd, pd.rseq) } else { deltimer(&pd.rt) pd.rt.f = nil } } if pd.wt.f == nil { if pd.wd > 0 && !combo { pd.wt.f = netpollWriteDeadline pd.wt.arg = pd pd.wt.seq = pd.wseq resettimer(&pd.wt, pd.wd) } } else if pd.wd != wd0 || combo != combo0 { pd.wseq++ // invalidate current timers if pd.wd > 0 && !combo { modtimer(&pd.wt, pd.wd, 0, netpollWriteDeadline, pd, pd.wseq) } else { deltimer(&pd.wt) pd.wt.f = nil } } // If we set the new deadline in the past, unblock currently pending IO if any. var rg, wg *g if pd.rd < 0 || pd.wd < 0 { atomic.StorepNoWB(noescape(unsafe.Pointer(&wg)), nil) // full memory barrier between stores to rd/wd and load of rg/wg in netpollunblock if pd.rd < 0 { rg = netpollunblock(pd, 'r', false) } if pd.wd < 0 { wg = netpollunblock(pd, 'w', false) } } unlock(&pd.lock) if rg != nil { netpollgoready(rg, 3) } if wg != nil { netpollgoready(wg, 3) } } //go:linkname poll_runtime_pollUnblock internal/poll.runtime_pollUnblock func poll_runtime_pollUnblock(pd *pollDesc) { lock(&pd.lock) if pd.closing { throw("runtime: unblock on closing polldesc") } pd.closing = true pd.rseq++ pd.wseq++ var rg, wg *g atomic.StorepNoWB(noescape(unsafe.Pointer(&rg)), nil) // full memory barrier between store to closing and read of rg/wg in netpollunblock rg = netpollunblock(pd, 'r', false) wg = netpollunblock(pd, 'w', false) if pd.rt.f != nil { deltimer(&pd.rt) pd.rt.f = nil } if pd.wt.f != nil { deltimer(&pd.wt) pd.wt.f = nil } unlock(&pd.lock) if rg != nil { netpollgoready(rg, 3) } if wg != nil { netpollgoready(wg, 3) } } // netpollready is called by the platform-specific netpoll function. // It declares that the fd associated with pd is ready for I/O. // The toRun argument is used to build a list of goroutines to return // from netpoll. The mode argument is 'r', 'w', or 'r'+'w' to indicate // whether the fd is ready for reading or writing or both. // // This may run while the world is stopped, so write barriers are not allowed. //go:nowritebarrier func netpollready(toRun *gList, pd *pollDesc, mode int32) { var rg, wg *g if mode == 'r' || mode == 'r'+'w' { rg = netpollunblock(pd, 'r', true) } if mode == 'w' || mode == 'r'+'w' { wg = netpollunblock(pd, 'w', true) } if rg != nil { toRun.push(rg) } if wg != nil { toRun.push(wg) } } func netpollcheckerr(pd *pollDesc, mode int32) int { if pd.closing { return 1 // ErrFileClosing or ErrNetClosing } if (mode == 'r' && pd.rd < 0) || (mode == 'w' && pd.wd < 0) { return 2 // ErrTimeout } // Report an event scanning error only on a read event. // An error on a write event will be captured in a subsequent // write call that is able to report a more specific error. if mode == 'r' && pd.everr { return 3 // ErrNotPollable } return 0 } func netpollblockcommit(gp *g, gpp unsafe.Pointer) bool { r := atomic.Casuintptr((*uintptr)(gpp), pdWait, uintptr(unsafe.Pointer(gp))) if r { // Bump the count of goroutines waiting for the poller. // The scheduler uses this to decide whether to block // waiting for the poller if there is nothing else to do. atomic.Xadd(&netpollWaiters, 1) } return r } func netpollgoready(gp *g, traceskip int) { atomic.Xadd(&netpollWaiters, -1) goready(gp, traceskip+1) } // returns true if IO is ready, or false if timedout or closed // waitio - wait only for completed IO, ignore errors func netpollblock(pd *pollDesc, mode int32, waitio bool) bool { gpp := &pd.rg if mode == 'w' { gpp = &pd.wg } // set the gpp semaphore to WAIT for { old := *gpp if old == pdReady { *gpp = 0 return true } if old != 0 { throw("runtime: double wait") } if atomic.Casuintptr(gpp, 0, pdWait) { break } } // need to recheck error states after setting gpp to WAIT // this is necessary because runtime_pollUnblock/runtime_pollSetDeadline/deadlineimpl // do the opposite: store to closing/rd/wd, membarrier, load of rg/wg if waitio || netpollcheckerr(pd, mode) == 0 { gopark(netpollblockcommit, unsafe.Pointer(gpp), waitReasonIOWait, traceEvGoBlockNet, 5) } // be careful to not lose concurrent READY notification old := atomic.Xchguintptr(gpp, 0) if old > pdWait { throw("runtime: corrupted polldesc") } return old == pdReady } func netpollunblock(pd *pollDesc, mode int32, ioready bool) *g { gpp := &pd.rg if mode == 'w' { gpp = &pd.wg } for { old := *gpp if old == pdReady { return nil } if old == 0 && !ioready { // Only set READY for ioready. runtime_pollWait // will check for timeout/cancel before waiting. return nil } var new uintptr if ioready { new = pdReady } if atomic.Casuintptr(gpp, old, new) { if old == pdReady || old == pdWait { old = 0 } return (*g)(unsafe.Pointer(old)) } } } func netpolldeadlineimpl(pd *pollDesc, seq uintptr, read, write bool) { lock(&pd.lock) // Seq arg is seq when the timer was set. // If it's stale, ignore the timer event. currentSeq := pd.rseq if !read { currentSeq = pd.wseq } if seq != currentSeq { // The descriptor was reused or timers were reset. unlock(&pd.lock) return } var rg *g if read { if pd.rd <= 0 || pd.rt.f == nil { throw("runtime: inconsistent read deadline") } pd.rd = -1 atomic.StorepNoWB(unsafe.Pointer(&pd.rt.f), nil) // full memory barrier between store to rd and load of rg in netpollunblock rg = netpollunblock(pd, 'r', false) } var wg *g if write { if pd.wd <= 0 || pd.wt.f == nil && !read { throw("runtime: inconsistent write deadline") } pd.wd = -1 atomic.StorepNoWB(unsafe.Pointer(&pd.wt.f), nil) // full memory barrier between store to wd and load of wg in netpollunblock wg = netpollunblock(pd, 'w', false) } unlock(&pd.lock) if rg != nil { netpollgoready(rg, 0) } if wg != nil { netpollgoready(wg, 0) } } func netpollDeadline(arg interface{}, seq uintptr) { netpolldeadlineimpl(arg.(*pollDesc), seq, true, true) } func netpollReadDeadline(arg interface{}, seq uintptr) { netpolldeadlineimpl(arg.(*pollDesc), seq, true, false) } func netpollWriteDeadline(arg interface{}, seq uintptr) { netpolldeadlineimpl(arg.(*pollDesc), seq, false, true) } func (c *pollCache) alloc() *pollDesc { lock(&c.lock) if c.first == nil { const pdSize = unsafe.Sizeof(pollDesc{}) n := pollBlockSize / pdSize if n == 0 { n = 1 } // Must be in non-GC memory because can be referenced // only from epoll/kqueue internals. mem := persistentalloc(n*pdSize, 0, &memstats.other_sys) for i := uintptr(0); i < n; i++ { pd := (*pollDesc)(add(mem, i*pdSize)) pd.link = c.first c.first = pd } } pd := c.first c.first = pd.link unlock(&c.lock) return pd }
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