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Current Path: /opt/golang/1.17.2/src/runtime

📁 ..
📄 HACKING.md(13.07 KB)
📄 Makefile(178 B)
📄 abi_test.go(2.88 KB)
📄 alg.go(9.45 KB)
📄 asm.s(715 B)
📄 asm_386.s(40.27 KB)
📄 asm_amd64.s(56.93 KB)
📄 asm_arm.s(30.23 KB)
📄 asm_arm64.s(33 KB)
📄 asm_mips64x.s(22.43 KB)
📄 asm_mipsx.s(24.39 KB)
📄 asm_ppc64x.h(1023 B)
📄 asm_ppc64x.s(29.16 KB)
📄 asm_riscv64.s(22.43 KB)
📄 asm_s390x.s(26.04 KB)
📄 asm_wasm.s(9.8 KB)
📄 atomic_arm64.s(259 B)
📄 atomic_mips64x.s(326 B)
📄 atomic_mipsx.s(284 B)
📄 atomic_pointer.go(2.62 KB)
📄 atomic_ppc64x.s(461 B)
📄 atomic_riscv64.s(275 B)
📄 auxv_none.go(360 B)
📄 callers_test.go(7.72 KB)
📁 cgo
📄 cgo.go(2.01 KB)
📄 cgo_mmap.go(2.42 KB)
📄 cgo_ppc64x.go(439 B)
📄 cgo_sigaction.go(3.17 KB)
📄 cgocall.go(18.88 KB)
📄 cgocallback.go(317 B)
📄 cgocheck.go(6.83 KB)
📄 chan.go(23.54 KB)
📄 chan_test.go(23.01 KB)
📄 chanbarrier_test.go(1.4 KB)
📄 checkptr.go(3.29 KB)
📄 checkptr_test.go(1.62 KB)
📄 closure_test.go(937 B)
📄 compiler.go(413 B)
📄 complex.go(1.59 KB)
📄 complex_test.go(1.05 KB)
📄 conv_wasm_test.go(2.96 KB)
📄 cpuflags.go(800 B)
📄 cpuflags_amd64.go(533 B)
📄 cpuflags_arm64.go(334 B)
📄 cpuprof.go(6.92 KB)
📄 cputicks.go(497 B)
📄 crash_cgo_test.go(16.17 KB)
📄 crash_nonunix_test.go(429 B)
📄 crash_test.go(20.96 KB)
📄 crash_unix_test.go(8.52 KB)
📁 debug
📄 debug.go(1.63 KB)
📄 debug_test.go(6.82 KB)
📄 debugcall.go(6.21 KB)
📄 debuglog.go(17.49 KB)
📄 debuglog_off.go(377 B)
📄 debuglog_on.go(1.11 KB)
📄 debuglog_test.go(4.56 KB)
📄 defer_test.go(10.32 KB)
📄 defs1_linux.go(862 B)
📄 defs1_netbsd_386.go(2.84 KB)
📄 defs1_netbsd_amd64.go(3.07 KB)
📄 defs1_netbsd_arm.go(2.96 KB)
📄 defs1_netbsd_arm64.go(3.18 KB)
📄 defs1_solaris_amd64.go(4.02 KB)
📄 defs2_linux.go(3.52 KB)
📄 defs3_linux.go(1.11 KB)
📄 defs_aix.go(4.18 KB)
📄 defs_aix_ppc64.go(3.63 KB)
📄 defs_arm_linux.go(2.69 KB)
📄 defs_darwin.go(3.79 KB)
📄 defs_darwin_amd64.go(6.07 KB)
📄 defs_darwin_arm64.go(3.89 KB)
📄 defs_dragonfly.go(2.63 KB)
📄 defs_dragonfly_amd64.go(3.31 KB)
📄 defs_freebsd.go(3.86 KB)
📄 defs_freebsd_386.go(4.38 KB)
📄 defs_freebsd_amd64.go(4.65 KB)
📄 defs_freebsd_arm.go(3.71 KB)
📄 defs_freebsd_arm64.go(4.03 KB)
📄 defs_illumos_amd64.go(285 B)
📄 defs_linux.go(3.05 KB)
📄 defs_linux_386.go(3.77 KB)
📄 defs_linux_amd64.go(4.28 KB)
📄 defs_linux_arm.go(3.45 KB)
📄 defs_linux_arm64.go(3.21 KB)
📄 defs_linux_mips64x.go(3.24 KB)
📄 defs_linux_mipsx.go(3.21 KB)
📄 defs_linux_ppc64.go(3.28 KB)
📄 defs_linux_ppc64le.go(3.28 KB)
📄 defs_linux_riscv64.go(3.27 KB)
📄 defs_linux_s390x.go(2.76 KB)
📄 defs_netbsd.go(2.76 KB)
📄 defs_netbsd_386.go(872 B)
📄 defs_netbsd_amd64.go(1.03 KB)
📄 defs_netbsd_arm.go(781 B)
📄 defs_openbsd.go(3.1 KB)
📄 defs_openbsd_386.go(2.89 KB)
📄 defs_openbsd_amd64.go(3.09 KB)
📄 defs_openbsd_arm.go(3 KB)
📄 defs_openbsd_arm64.go(2.76 KB)
📄 defs_openbsd_mips64.go(2.66 KB)
📄 defs_plan9_386.go(1.63 KB)
📄 defs_plan9_amd64.go(1.82 KB)
📄 defs_plan9_arm.go(1.73 KB)
📄 defs_solaris.go(3.35 KB)
📄 defs_solaris_amd64.go(1021 B)
📄 defs_windows.go(2.09 KB)
📄 defs_windows_386.go(1.98 KB)
📄 defs_windows_amd64.go(2.71 KB)
📄 defs_windows_arm.go(2.11 KB)
📄 defs_windows_arm64.go(2.63 KB)
📄 duff_386.s(8.24 KB)
📄 duff_amd64.s(5.62 KB)
📄 duff_arm.s(7.11 KB)
📄 duff_arm64.s(5.25 KB)
📄 duff_mips64x.s(11.31 KB)
📄 duff_ppc64x.s(2.43 KB)
📄 duff_riscv64.s(11.38 KB)
📄 duff_s390x.s(507 B)
📄 env_plan9.go(2.99 KB)
📄 env_posix.go(1.95 KB)
📄 env_test.go(1.16 KB)
📄 error.go(9.23 KB)
📄 example_test.go(1.55 KB)
📄 export_aix_test.go(204 B)
📄 export_arm_test.go(226 B)
📄 export_darwin_test.go(351 B)
📄 export_debug_regabiargs_off_test.go(416 B)
📄 export_debug_regabiargs_on_test.go(1.39 KB)
📄 export_debug_test.go(5.86 KB)
📄 export_debuglog_test.go(1.27 KB)
📄 export_futex_test.go(570 B)
📄 export_linux_test.go(429 B)
📄 export_mmap_test.go(571 B)
📄 export_pipe2_test.go(436 B)
📄 export_pipe_test.go(240 B)
📄 export_solaris_test.go(282 B)
📄 export_test.go(30.12 KB)
📄 export_unix_test.go(2.35 KB)
📄 export_windows_test.go(652 B)
📄 extern.go(12.58 KB)
📄 fastlog2.go(1.22 KB)
📄 fastlog2_test.go(784 B)
📄 fastlog2table.go(904 B)
📄 float.go(1.35 KB)
📄 funcdata.h(2.47 KB)
📄 futex_test.go(2.15 KB)
📄 gc_test.go(19.21 KB)
📄 gcinfo_test.go(5.69 KB)
📄 go_tls.h(366 B)
📄 hash32.go(1.61 KB)
📄 hash64.go(2.01 KB)
📄 hash_test.go(16.5 KB)
📄 heapdump.go(17.74 KB)
📄 histogram.go(6.42 KB)
📄 histogram_test.go(1.85 KB)
📄 iface.go(16.13 KB)
📄 iface_test.go(7.51 KB)
📁 internal
📄 lfstack.go(1.77 KB)
📄 lfstack_32bit.go(562 B)
📄 lfstack_64bit.go(2.24 KB)
📄 lfstack_test.go(2.78 KB)
📄 libfuzzer.go(2.6 KB)
📄 libfuzzer_amd64.s(961 B)
📄 libfuzzer_arm64.s(772 B)
📄 lock_futex.go(5.22 KB)
📄 lock_js.go(5.81 KB)
📄 lock_sema.go(6.8 KB)
📄 lockrank.go(11.62 KB)
📄 lockrank_off.go(1.17 KB)
📄 lockrank_on.go(9.84 KB)
📄 lockrank_test.go(1.15 KB)
📄 malloc.go(52.33 KB)
📄 malloc_test.go(10.83 KB)
📄 map.go(42.47 KB)
📄 map_benchmark_test.go(10.51 KB)
📄 map_fast32.go(12.63 KB)
📄 map_fast64.go(12.82 KB)
📄 map_faststr.go(14.15 KB)
📄 map_test.go(27.52 KB)
📄 mbarrier.go(12.2 KB)
📄 mbitmap.go(65.27 KB)
📄 mcache.go(9.68 KB)
📄 mcentral.go(7.8 KB)
📄 mcheckmark.go(2.81 KB)
📄 mem_aix.go(1.94 KB)
📄 mem_bsd.go(2.12 KB)
📄 mem_darwin.go(1.88 KB)
📄 mem_js.go(2.35 KB)
📄 mem_linux.go(5.59 KB)
📄 mem_plan9.go(4.53 KB)
📄 mem_windows.go(3.87 KB)
📄 memclr_386.s(2.42 KB)
📄 memclr_amd64.s(3.89 KB)
📄 memclr_arm.s(2.6 KB)
📄 memclr_arm64.s(3.65 KB)
📄 memclr_mips64x.s(1.75 KB)
📄 memclr_mipsx.s(1.35 KB)
📄 memclr_plan9_386.s(983 B)
📄 memclr_plan9_amd64.s(511 B)
📄 memclr_ppc64x.s(4.31 KB)
📄 memclr_riscv64.s(926 B)
📄 memclr_s390x.s(1.96 KB)
📄 memclr_wasm.s(622 B)
📄 memmove_386.s(4.46 KB)
📄 memmove_amd64.s(12.66 KB)
📄 memmove_arm.s(5.9 KB)
📄 memmove_arm64.s(6 KB)
📄 memmove_linux_amd64_test.go(1.6 KB)
📄 memmove_mips64x.s(1.85 KB)
📄 memmove_mipsx.s(4.42 KB)
📄 memmove_plan9_386.s(3.06 KB)
📄 memmove_plan9_amd64.s(3.04 KB)
📄 memmove_ppc64x.s(4.11 KB)
📄 memmove_riscv64.s(1.81 KB)
📄 memmove_s390x.s(2.92 KB)
📄 memmove_test.go(12.04 KB)
📄 memmove_wasm.s(1.74 KB)
📁 metrics
📄 metrics.go(17.69 KB)
📄 metrics_test.go(12.48 KB)
📄 mfinal.go(15.76 KB)
📄 mfinal_test.go(5.85 KB)
📄 mfixalloc.go(2.73 KB)
📄 mgc.go(55.18 KB)
📄 mgcmark.go(45.54 KB)
📄 mgcpacer.go(29.56 KB)
📄 mgcscavenge.go(35.05 KB)
📄 mgcscavenge_test.go(12.74 KB)
📄 mgcstack.go(10.58 KB)
📄 mgcsweep.go(23.56 KB)
📄 mgcwork.go(12.82 KB)
📄 mheap.go(66.31 KB)
📄 mkduff.go(7.19 KB)
📄 mkfastlog2table.go(1.32 KB)
📄 mkpreempt.go(14.17 KB)
📄 mksizeclasses.go(9.31 KB)
📄 mmap.go(990 B)
📄 mpagealloc.go(36.77 KB)
📄 mpagealloc_32bit.go(3.81 KB)
📄 mpagealloc_64bit.go(6.65 KB)
📄 mpagealloc_test.go(32.38 KB)
📄 mpagecache.go(5.28 KB)
📄 mpagecache_test.go(9.93 KB)
📄 mpallocbits.go(12.01 KB)
📄 mpallocbits_test.go(13.69 KB)
📄 mprof.go(25.82 KB)
📄 mranges.go(11.84 KB)
📄 mranges_test.go(5.68 KB)
📁 msan
📄 msan.go(1.51 KB)
📄 msan0.go(741 B)
📄 msan_amd64.s(2.32 KB)
📄 msan_arm64.s(2.01 KB)
📄 msize.go(777 B)
📄 mspanset.go(12.2 KB)
📄 mstats.go(30.65 KB)
📄 mwbbuf.go(9.3 KB)
📄 nbpipe_fcntl_libc_test.go(499 B)
📄 nbpipe_fcntl_unix_test.go(507 B)
📄 nbpipe_pipe.go(426 B)
📄 nbpipe_pipe2.go(592 B)
📄 nbpipe_test.go(2.26 KB)
📄 net_plan9.go(645 B)
📄 netpoll.go(16.24 KB)
📄 netpoll_aix.go(4.87 KB)
📄 netpoll_epoll.go(4.21 KB)
📄 netpoll_fake.go(670 B)
📄 netpoll_kqueue.go(4.64 KB)
📄 netpoll_os_test.go(360 B)
📄 netpoll_solaris.go(10.75 KB)
📄 netpoll_stub.go(1.42 KB)
📄 netpoll_windows.go(3.75 KB)
📄 norace_linux_test.go(905 B)
📄 norace_test.go(996 B)
📄 numcpu_freebsd_test.go(381 B)
📄 os2_aix.go(20.45 KB)
📄 os2_freebsd.go(302 B)
📄 os2_openbsd.go(296 B)
📄 os2_plan9.go(1.48 KB)
📄 os2_solaris.go(320 B)
📄 os3_plan9.go(3.88 KB)
📄 os3_solaris.go(17.02 KB)
📄 os_aix.go(8.06 KB)
📄 os_android.go(463 B)
📄 os_darwin.go(11.54 KB)
📄 os_darwin_arm64.go(416 B)
📄 os_dragonfly.go(6.46 KB)
📄 os_freebsd.go(11.2 KB)
📄 os_freebsd2.go(507 B)
📄 os_freebsd_amd64.go(529 B)
📄 os_freebsd_arm.go(1.32 KB)
📄 os_freebsd_arm64.go(398 B)
📄 os_freebsd_noauxv.go(264 B)
📄 os_illumos.go(3.93 KB)
📄 os_js.go(3.26 KB)
📄 os_linux.go(13.47 KB)
📄 os_linux_arm.go(1.35 KB)
📄 os_linux_arm64.go(572 B)
📄 os_linux_be64.go(862 B)
📄 os_linux_generic.go(950 B)
📄 os_linux_mips64x.go(1.11 KB)
📄 os_linux_mipsx.go(1.09 KB)
📄 os_linux_noauxv.go(408 B)
📄 os_linux_novdso.go(387 B)
📄 os_linux_ppc64x.go(566 B)
📄 os_linux_riscv64.go(198 B)
📄 os_linux_s390x.go(316 B)
📄 os_linux_x86.go(270 B)
📄 os_netbsd.go(9.09 KB)
📄 os_netbsd_386.go(588 B)
📄 os_netbsd_amd64.go(585 B)
📄 os_netbsd_arm.go(1.13 KB)
📄 os_netbsd_arm64.go(827 B)
📄 os_nonopenbsd.go(456 B)
📄 os_only_solaris.go(376 B)
📄 os_openbsd.go(6.01 KB)
📄 os_openbsd_arm.go(749 B)
📄 os_openbsd_arm64.go(416 B)
📄 os_openbsd_libc.go(1.7 KB)
📄 os_openbsd_mips64.go(416 B)
📄 os_openbsd_syscall.go(1.27 KB)
📄 os_openbsd_syscall1.go(466 B)
📄 os_openbsd_syscall2.go(2.5 KB)
📄 os_plan9.go(10.2 KB)
📄 os_plan9_arm.go(462 B)
📄 os_solaris.go(6.49 KB)
📄 os_windows.go(43.68 KB)
📄 os_windows_arm.go(511 B)
📄 os_windows_arm64.go(339 B)
📄 panic.go(44.28 KB)
📄 panic32.go(4.83 KB)
📄 panic_test.go(1.71 KB)
📄 plugin.go(4.27 KB)
📁 pprof
📄 preempt.go(15.4 KB)
📄 preempt_386.s(1.07 KB)
📄 preempt_amd64.s(1.81 KB)
📄 preempt_arm.s(1.66 KB)
📄 preempt_arm64.s(2.99 KB)
📄 preempt_mips64x.s(2.93 KB)
📄 preempt_mipsx.s(2.89 KB)
📄 preempt_nonwindows.go(309 B)
📄 preempt_ppc64x.s(2.92 KB)
📄 preempt_riscv64.s(2.48 KB)
📄 preempt_s390x.s(1.19 KB)
📄 preempt_wasm.s(365 B)
📄 print.go(5.95 KB)
📄 proc.go(181.46 KB)
📄 proc_runtime_test.go(820 B)
📄 proc_test.go(25.02 KB)
📄 profbuf.go(18.26 KB)
📄 profbuf_test.go(8.65 KB)
📄 proflabel.go(1.52 KB)
📁 race
📄 race.go(18.56 KB)
📄 race0.go(2.81 KB)
📄 race_amd64.s(14.46 KB)
📄 race_arm64.s(13.71 KB)
📄 race_ppc64le.s(17.72 KB)
📄 rand_test.go(783 B)
📄 rdebug.go(553 B)
📄 relax_stub.go(617 B)
📄 rt0_aix_ppc64.s(4.33 KB)
📄 rt0_android_386.s(822 B)
📄 rt0_android_amd64.s(754 B)
📄 rt0_android_arm.s(843 B)
📄 rt0_android_arm64.s(941 B)
📄 rt0_darwin_amd64.s(399 B)
📄 rt0_darwin_arm64.s(2.27 KB)
📄 rt0_dragonfly_amd64.s(448 B)
📄 rt0_freebsd_386.s(454 B)
📄 rt0_freebsd_amd64.s(442 B)
📄 rt0_freebsd_arm.s(298 B)
📄 rt0_freebsd_arm64.s(2.46 KB)
📄 rt0_illumos_amd64.s(311 B)
📄 rt0_ios_amd64.s(425 B)
📄 rt0_ios_arm64.s(425 B)
📄 rt0_js_wasm.s(2.3 KB)
📄 rt0_linux_386.s(450 B)
📄 rt0_linux_amd64.s(307 B)
📄 rt0_linux_arm.s(1007 B)
📄 rt0_linux_arm64.s(2.39 KB)
📄 rt0_linux_mips64x.s(1.03 KB)
📄 rt0_linux_mipsx.s(835 B)
📄 rt0_linux_ppc64.s(865 B)
📄 rt0_linux_ppc64le.s(3.88 KB)
📄 rt0_linux_riscv64.s(370 B)
📄 rt0_linux_s390x.s(676 B)
📄 rt0_netbsd_386.s(452 B)
📄 rt0_netbsd_amd64.s(309 B)
📄 rt0_netbsd_arm.s(296 B)
📄 rt0_netbsd_arm64.s(2.38 KB)
📄 rt0_openbsd_386.s(454 B)
📄 rt0_openbsd_amd64.s(311 B)
📄 rt0_openbsd_arm.s(298 B)
📄 rt0_openbsd_arm64.s(2.54 KB)
📄 rt0_openbsd_mips64.s(976 B)
📄 rt0_plan9_386.s(523 B)
📄 rt0_plan9_amd64.s(481 B)
📄 rt0_plan9_arm.s(397 B)
📄 rt0_solaris_amd64.s(311 B)
📄 rt0_windows_386.s(1.28 KB)
📄 rt0_windows_amd64.s(986 B)
📄 rt0_windows_arm.s(386 B)
📄 rt0_windows_arm64.s(725 B)
📄 runtime-gdb.py(15.02 KB)
📄 runtime-gdb_test.go(20.19 KB)
📄 runtime-lldb_test.go(4.95 KB)
📄 runtime.go(1.42 KB)
📄 runtime1.go(12.63 KB)
📄 runtime2.go(42.27 KB)
📄 runtime_linux_test.go(1.46 KB)
📄 runtime_mmap_test.go(1.91 KB)
📄 runtime_test.go(7.81 KB)
📄 runtime_unix_test.go(1.29 KB)
📄 rwmutex.go(3.53 KB)
📄 rwmutex_test.go(4.03 KB)
📄 select.go(14.45 KB)
📄 sema.go(16.08 KB)
📄 sema_test.go(2.5 KB)
📄 semasleep_test.go(1.65 KB)
📄 sigaction.go(543 B)
📄 signal_386.go(1.72 KB)
📄 signal_aix_ppc64.go(3.56 KB)
📄 signal_amd64.go(2.71 KB)
📄 signal_arm.go(2.56 KB)
📄 signal_arm64.go(3.16 KB)
📄 signal_darwin.go(2.13 KB)
📄 signal_darwin_amd64.go(3.85 KB)
📄 signal_darwin_arm64.go(3.6 KB)
📄 signal_dragonfly.go(2.17 KB)
📄 signal_dragonfly_amd64.go(2.01 KB)
📄 signal_freebsd.go(2.2 KB)
📄 signal_freebsd_386.go(1.55 KB)
📄 signal_freebsd_amd64.go(2.03 KB)
📄 signal_freebsd_arm.go(2.18 KB)
📄 signal_freebsd_arm64.go(3.23 KB)
📄 signal_linux_386.go(1.59 KB)
📄 signal_linux_amd64.go(2.05 KB)
📄 signal_linux_arm.go(2.13 KB)
📄 signal_linux_arm64.go(2.95 KB)
📄 signal_linux_mips64x.go(3.39 KB)
📄 signal_linux_mipsx.go(3.7 KB)
📄 signal_linux_ppc64x.go(3.46 KB)
📄 signal_linux_riscv64.go(2.92 KB)
📄 signal_linux_s390x.go(4.43 KB)
📄 signal_mips64x.go(3.2 KB)
📄 signal_mipsx.go(3.07 KB)
📄 signal_netbsd.go(2.18 KB)
📄 signal_netbsd_386.go(1.76 KB)
📄 signal_netbsd_amd64.go(2.33 KB)
📄 signal_netbsd_arm.go(2.3 KB)
📄 signal_netbsd_arm64.go(3.4 KB)
📄 signal_openbsd.go(2.18 KB)
📄 signal_openbsd_386.go(1.58 KB)
📄 signal_openbsd_amd64.go(2.04 KB)
📄 signal_openbsd_arm.go(2.12 KB)
📄 signal_openbsd_arm64.go(3.38 KB)
📄 signal_openbsd_mips64.go(3.28 KB)
📄 signal_plan9.go(1.93 KB)
📄 signal_ppc64x.go(3.64 KB)
📄 signal_riscv64.go(2.88 KB)
📄 signal_solaris.go(4.5 KB)
📄 signal_solaris_amd64.go(2.47 KB)
📄 signal_unix.go(37.82 KB)
📄 signal_windows.go(9.2 KB)
📄 signal_windows_test.go(5.73 KB)
📄 sigqueue.go(8.76 KB)
📄 sigqueue_note.go(673 B)
📄 sigqueue_plan9.go(3.39 KB)
📄 sigtab_aix.go(11.3 KB)
📄 sigtab_linux_generic.go(3.56 KB)
📄 sigtab_linux_mipsx.go(6.01 KB)
📄 sizeclasses.go(9.14 KB)
📄 sizeof_test.go(905 B)
📄 slice.go(8.94 KB)
📄 slice_test.go(10.32 KB)
📄 softfloat64.go(10.78 KB)
📄 softfloat64_test.go(4.05 KB)
📄 stack.go(41.92 KB)
📄 stack_test.go(21.05 KB)
📄 string.go(10.85 KB)
📄 string_test.go(9.62 KB)
📄 stubs.go(18.17 KB)
📄 stubs2.go(1.14 KB)
📄 stubs3.go(331 B)
📄 stubs_386.go(550 B)
📄 stubs_amd64.go(1.2 KB)
📄 stubs_arm.go(531 B)
📄 stubs_arm64.go(351 B)
📄 stubs_linux.go(663 B)
📄 stubs_mips64x.go(390 B)
📄 stubs_mipsx.go(305 B)
📄 stubs_nonlinux.go(315 B)
📄 stubs_ppc64.go(383 B)
📄 stubs_ppc64le.go(271 B)
📄 stubs_s390x.go(256 B)
📄 symtab.go(32.29 KB)
📄 symtab_test.go(6.78 KB)
📄 sys_aix_ppc64.s(7.13 KB)
📄 sys_arm.go(521 B)
📄 sys_arm64.go(469 B)
📄 sys_darwin.go(15.91 KB)
📄 sys_darwin_amd64.s(18.52 KB)
📄 sys_darwin_arm64.go(1.68 KB)
📄 sys_darwin_arm64.s(17.23 KB)
📄 sys_dragonfly_amd64.s(8.42 KB)
📄 sys_freebsd_386.s(8.98 KB)
📄 sys_freebsd_amd64.s(10.55 KB)
📄 sys_freebsd_arm.s(10.69 KB)
📄 sys_freebsd_arm64.s(10.33 KB)
📄 sys_libc.go(1.87 KB)
📄 sys_linux_386.s(18.17 KB)
📄 sys_linux_amd64.s(16.25 KB)
📄 sys_linux_arm.s(15.84 KB)
📄 sys_linux_arm64.s(15.26 KB)
📄 sys_linux_mips64x.s(13.4 KB)
📄 sys_linux_mipsx.s(11.16 KB)
📄 sys_linux_ppc64x.s(21.48 KB)
📄 sys_linux_riscv64.s(10.35 KB)
📄 sys_linux_s390x.s(10.52 KB)
📄 sys_mips64x.go(526 B)
📄 sys_mipsx.go(518 B)
📄 sys_netbsd_386.s(10.13 KB)
📄 sys_netbsd_amd64.s(9.91 KB)
📄 sys_netbsd_arm.s(10.94 KB)
📄 sys_netbsd_arm64.s(10.42 KB)
📄 sys_nonppc64x.go(271 B)
📄 sys_openbsd.go(2.3 KB)
📄 sys_openbsd1.go(1.16 KB)
📄 sys_openbsd2.go(7.31 KB)
📄 sys_openbsd3.go(3.29 KB)
📄 sys_openbsd_386.s(19.97 KB)
📄 sys_openbsd_amd64.s(16.44 KB)
📄 sys_openbsd_arm.s(18.09 KB)
📄 sys_openbsd_arm64.s(15.92 KB)
📄 sys_openbsd_mips64.s(9.22 KB)
📄 sys_plan9_386.s(4.4 KB)
📄 sys_plan9_amd64.s(4.47 KB)
📄 sys_plan9_arm.s(7.03 KB)
📄 sys_ppc64x.go(556 B)
📄 sys_riscv64.go(469 B)
📄 sys_s390x.go(469 B)
📄 sys_solaris_amd64.s(6.69 KB)
📄 sys_wasm.go(732 B)
📄 sys_wasm.s(2.65 KB)
📄 sys_windows_386.s(7.74 KB)
📄 sys_windows_amd64.s(9.16 KB)
📄 sys_windows_arm.s(12.02 KB)
📄 sys_windows_arm64.s(12.51 KB)
📄 sys_x86.go(574 B)
📄 syscall2_solaris.go(1.65 KB)
📄 syscall_aix.go(5.99 KB)
📄 syscall_solaris.go(8.26 KB)
📄 syscall_windows.go(16.48 KB)
📄 syscall_windows_test.go(32.53 KB)
📁 testdata
📄 textflag.h(1.52 KB)
📄 time.go(30.56 KB)
📄 time_fake.go(2.38 KB)
📄 time_linux_amd64.s(2.18 KB)
📄 time_nofake.go(587 B)
📄 time_test.go(2.03 KB)
📄 time_windows.h(694 B)
📄 time_windows_386.s(1.81 KB)
📄 time_windows_amd64.s(1.07 KB)
📄 time_windows_arm.s(2.07 KB)
📄 time_windows_arm64.s(1.33 KB)
📄 timeasm.go(468 B)
📄 timestub.go(595 B)
📄 timestub2.go(447 B)
📄 tls_arm.s(3.33 KB)
📄 tls_arm64.h(1.22 KB)
📄 tls_arm64.s(1.2 KB)
📄 tls_mips64x.s(759 B)
📄 tls_mipsx.s(731 B)
📄 tls_ppc64x.s(1.52 KB)
📄 tls_riscv64.s(726 B)
📄 tls_s390x.s(1.55 KB)
📄 tls_stub.go(294 B)
📄 tls_windows_amd64.go(294 B)
📁 trace
📄 trace.go(38.36 KB)
📄 traceback.go(46.51 KB)
📄 traceback_test.go(8.04 KB)
📄 type.go(18.59 KB)
📄 typekind.go(742 B)
📄 utf8.go(3.39 KB)
📄 vdso_elf32.go(2.79 KB)
📄 vdso_elf64.go(2.87 KB)
📄 vdso_freebsd.go(2.46 KB)
📄 vdso_freebsd_arm.go(454 B)
📄 vdso_freebsd_arm64.go(443 B)
📄 vdso_freebsd_x86.go(1.89 KB)
📄 vdso_in_none.go(490 B)
📄 vdso_linux.go(7.77 KB)
📄 vdso_linux_386.go(669 B)
📄 vdso_linux_amd64.go(685 B)
📄 vdso_linux_arm.go(669 B)
📄 vdso_linux_arm64.go(670 B)
📄 vdso_linux_mips64x.go(892 B)
📄 vdso_linux_ppc64x.go(712 B)
📄 vlop_386.s(2.02 KB)
📄 vlop_arm.s(7.06 KB)
📄 vlop_arm_test.go(3.75 KB)
📄 vlrt.go(5.91 KB)
📄 wincallback.go(3.52 KB)
📄 write_err.go(310 B)
📄 write_err_android.go(4.65 KB)
📄 zcallback_windows.go(155 B)
📄 zcallback_windows.s(63.05 KB)
📄 zcallback_windows_arm.s(89.34 KB)
📄 zcallback_windows_arm64.s(89.34 KB)

Editing: gc_test.go

// Copyright 2011 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_test

import (
	"fmt"
	"math/rand"
	"os"
	"reflect"
	"runtime"
	"runtime/debug"
	"sort"
	"strings"
	"sync"
	"sync/atomic"
	"testing"
	"time"
	"unsafe"
)

func TestGcSys(t *testing.T) {
	if os.Getenv("GOGC") == "off" {
		t.Skip("skipping test; GOGC=off in environment")
	}
	got := runTestProg(t, "testprog", "GCSys")
	want := "OK\n"
	if got != want {
		t.Fatalf("expected %q, but got %q", want, got)
	}
}

func TestGcDeepNesting(t *testing.T) {
	type T [2][2][2][2][2][2][2][2][2][2]*int
	a := new(T)

// Prevent the compiler from applying escape analysis.
	// This makes sure new(T) is allocated on heap, not on the stack.
	t.Logf("%p", a)

a[0][0][0][0][0][0][0][0][0][0] = new(int)
	*a[0][0][0][0][0][0][0][0][0][0] = 13
	runtime.GC()
	if *a[0][0][0][0][0][0][0][0][0][0] != 13 {
		t.Fail()
	}
}

func TestGcMapIndirection(t *testing.T) {
	defer debug.SetGCPercent(debug.SetGCPercent(1))
	runtime.GC()
	type T struct {
		a [256]int
	}
	m := make(map[T]T)
	for i := 0; i < 2000; i++ {
		var a T
		a.a[0] = i
		m[a] = T{}
	}
}

func TestGcArraySlice(t *testing.T) {
	type X struct {
		buf     [1]byte
		nextbuf []byte
		next    *X
	}
	var head *X
	for i := 0; i < 10; i++ {
		p := &X{}
		p.buf[0] = 42
		p.next = head
		if head != nil {
			p.nextbuf = head.buf[:]
		}
		head = p
		runtime.GC()
	}
	for p := head; p != nil; p = p.next {
		if p.buf[0] != 42 {
			t.Fatal("corrupted heap")
		}
	}
}

func TestGcRescan(t *testing.T) {
	type X struct {
		c     chan error
		nextx *X
	}
	type Y struct {
		X
		nexty *Y
		p     *int
	}
	var head *Y
	for i := 0; i < 10; i++ {
		p := &Y{}
		p.c = make(chan error)
		if head != nil {
			p.nextx = &head.X
		}
		p.nexty = head
		p.p = new(int)
		*p.p = 42
		head = p
		runtime.GC()
	}
	for p := head; p != nil; p = p.nexty {
		if *p.p != 42 {
			t.Fatal("corrupted heap")
		}
	}
}

func TestGcLastTime(t *testing.T) {
	ms := new(runtime.MemStats)
	t0 := time.Now().UnixNano()
	runtime.GC()
	t1 := time.Now().UnixNano()
	runtime.ReadMemStats(ms)
	last := int64(ms.LastGC)
	if t0 > last || last > t1 {
		t.Fatalf("bad last GC time: got %v, want [%v, %v]", last, t0, t1)
	}
	pause := ms.PauseNs[(ms.NumGC+255)%256]
	// Due to timer granularity, pause can actually be 0 on windows
	// or on virtualized environments.
	if pause == 0 {
		t.Logf("last GC pause was 0")
	} else if pause > 10e9 {
		t.Logf("bad last GC pause: got %v, want [0, 10e9]", pause)
	}
}

var hugeSink interface{}

func TestHugeGCInfo(t *testing.T) {
	// The test ensures that compiler can chew these huge types even on weakest machines.
	// The types are not allocated at runtime.
	if hugeSink != nil {
		// 400MB on 32 bots, 4TB on 64-bits.
		const n = (400 << 20) + (unsafe.Sizeof(uintptr(0))-4)<<40
		hugeSink = new([n]*byte)
		hugeSink = new([n]uintptr)
		hugeSink = new(struct {
			x float64
			y [n]*byte
			z []string
		})
		hugeSink = new(struct {
			x float64
			y [n]uintptr
			z []string
		})
	}
}

func TestPeriodicGC(t *testing.T) {
	if runtime.GOARCH == "wasm" {
		t.Skip("no sysmon on wasm yet")
	}

// Make sure we're not in the middle of a GC.
	runtime.GC()

var ms1, ms2 runtime.MemStats
	runtime.ReadMemStats(&ms1)

// Make periodic GC run continuously.
	orig := *runtime.ForceGCPeriod
	*runtime.ForceGCPeriod = 0

// Let some periodic GCs happen. In a heavily loaded system,
	// it's possible these will be delayed, so this is designed to
	// succeed quickly if things are working, but to give it some
	// slack if things are slow.
	var numGCs uint32
	const want = 2
	for i := 0; i < 200 && numGCs < want; i++ {
		time.Sleep(5 * time.Millisecond)

// Test that periodic GC actually happened.
		runtime.ReadMemStats(&ms2)
		numGCs = ms2.NumGC - ms1.NumGC
	}
	*runtime.ForceGCPeriod = orig

if numGCs < want {
		t.Fatalf("no periodic GC: got %v GCs, want >= 2", numGCs)
	}
}

func TestGcZombieReporting(t *testing.T) {
	// This test is somewhat sensitive to how the allocator works.
	got := runTestProg(t, "testprog", "GCZombie")
	want := "found pointer to free object"
	if !strings.Contains(got, want) {
		t.Fatalf("expected %q in output, but got %q", want, got)
	}
}

func TestGCTestMoveStackOnNextCall(t *testing.T) {
	t.Parallel()
	var onStack int
	// GCTestMoveStackOnNextCall can fail in rare cases if there's
	// a preemption. This won't happen many times in quick
	// succession, so just retry a few times.
	for retry := 0; retry < 5; retry++ {
		runtime.GCTestMoveStackOnNextCall()
		if moveStackCheck(t, &onStack, uintptr(unsafe.Pointer(&onStack))) {
			// Passed.
			return
		}
	}
	t.Fatal("stack did not move")
}

// This must not be inlined because the point is to force a stack
// growth check and move the stack.
//
//go:noinline
func moveStackCheck(t *testing.T, new *int, old uintptr) bool {
	// new should have been updated by the stack move;
	// old should not have.

// Capture new's value before doing anything that could
	// further move the stack.
	new2 := uintptr(unsafe.Pointer(new))

t.Logf("old stack pointer %x, new stack pointer %x", old, new2)
	if new2 == old {
		// Check that we didn't screw up the test's escape analysis.
		if cls := runtime.GCTestPointerClass(unsafe.Pointer(new)); cls != "stack" {
			t.Fatalf("test bug: new (%#x) should be a stack pointer, not %s", new2, cls)
		}
		// This was a real failure.
		return false
	}
	return true
}

func TestGCTestMoveStackRepeatedly(t *testing.T) {
	// Move the stack repeatedly to make sure we're not doubling
	// it each time.
	for i := 0; i < 100; i++ {
		runtime.GCTestMoveStackOnNextCall()
		moveStack1(false)
	}
}

//go:noinline
func moveStack1(x bool) {
	// Make sure this function doesn't get auto-nosplit.
	if x {
		println("x")
	}
}

func TestGCTestIsReachable(t *testing.T) {
	var all, half []unsafe.Pointer
	var want uint64
	for i := 0; i < 16; i++ {
		// The tiny allocator muddies things, so we use a
		// scannable type.
		p := unsafe.Pointer(new(*int))
		all = append(all, p)
		if i%2 == 0 {
			half = append(half, p)
			want |= 1 << i
		}
	}

got := runtime.GCTestIsReachable(all...)
	if want != got {
		t.Fatalf("did not get expected reachable set; want %b, got %b", want, got)
	}
	runtime.KeepAlive(half)
}

var pointerClassSink *int
var pointerClassData = 42

func TestGCTestPointerClass(t *testing.T) {
	t.Parallel()
	check := func(p unsafe.Pointer, want string) {
		t.Helper()
		got := runtime.GCTestPointerClass(p)
		if got != want {
			// Convert the pointer to a uintptr to avoid
			// escaping it.
			t.Errorf("for %#x, want class %s, got %s", uintptr(p), want, got)
		}
	}
	var onStack int
	var notOnStack int
	pointerClassSink = &notOnStack
	check(unsafe.Pointer(&onStack), "stack")
	check(unsafe.Pointer(&notOnStack), "heap")
	check(unsafe.Pointer(&pointerClassSink), "bss")
	check(unsafe.Pointer(&pointerClassData), "data")
	check(nil, "other")
}

func BenchmarkSetTypePtr(b *testing.B) {
	benchSetType(b, new(*byte))
}

func BenchmarkSetTypePtr8(b *testing.B) {
	benchSetType(b, new([8]*byte))
}

func BenchmarkSetTypePtr16(b *testing.B) {
	benchSetType(b, new([16]*byte))
}

func BenchmarkSetTypePtr32(b *testing.B) {
	benchSetType(b, new([32]*byte))
}

func BenchmarkSetTypePtr64(b *testing.B) {
	benchSetType(b, new([64]*byte))
}

func BenchmarkSetTypePtr126(b *testing.B) {
	benchSetType(b, new([126]*byte))
}

func BenchmarkSetTypePtr128(b *testing.B) {
	benchSetType(b, new([128]*byte))
}

func BenchmarkSetTypePtrSlice(b *testing.B) {
	benchSetType(b, make([]*byte, 1<<10))
}

type Node1 struct {
	Value       [1]uintptr
	Left, Right *byte
}

func BenchmarkSetTypeNode1(b *testing.B) {
	benchSetType(b, new(Node1))
}

func BenchmarkSetTypeNode1Slice(b *testing.B) {
	benchSetType(b, make([]Node1, 32))
}

type Node8 struct {
	Value       [8]uintptr
	Left, Right *byte
}

func BenchmarkSetTypeNode8(b *testing.B) {
	benchSetType(b, new(Node8))
}

func BenchmarkSetTypeNode8Slice(b *testing.B) {
	benchSetType(b, make([]Node8, 32))
}

type Node64 struct {
	Value       [64]uintptr
	Left, Right *byte
}

func BenchmarkSetTypeNode64(b *testing.B) {
	benchSetType(b, new(Node64))
}

func BenchmarkSetTypeNode64Slice(b *testing.B) {
	benchSetType(b, make([]Node64, 32))
}

type Node64Dead struct {
	Left, Right *byte
	Value       [64]uintptr
}

func BenchmarkSetTypeNode64Dead(b *testing.B) {
	benchSetType(b, new(Node64Dead))
}

func BenchmarkSetTypeNode64DeadSlice(b *testing.B) {
	benchSetType(b, make([]Node64Dead, 32))
}

type Node124 struct {
	Value       [124]uintptr
	Left, Right *byte
}

func BenchmarkSetTypeNode124(b *testing.B) {
	benchSetType(b, new(Node124))
}

func BenchmarkSetTypeNode124Slice(b *testing.B) {
	benchSetType(b, make([]Node124, 32))
}

type Node126 struct {
	Value       [126]uintptr
	Left, Right *byte
}

func BenchmarkSetTypeNode126(b *testing.B) {
	benchSetType(b, new(Node126))
}

func BenchmarkSetTypeNode126Slice(b *testing.B) {
	benchSetType(b, make([]Node126, 32))
}

type Node128 struct {
	Value       [128]uintptr
	Left, Right *byte
}

func BenchmarkSetTypeNode128(b *testing.B) {
	benchSetType(b, new(Node128))
}

func BenchmarkSetTypeNode128Slice(b *testing.B) {
	benchSetType(b, make([]Node128, 32))
}

type Node130 struct {
	Value       [130]uintptr
	Left, Right *byte
}

func BenchmarkSetTypeNode130(b *testing.B) {
	benchSetType(b, new(Node130))
}

func BenchmarkSetTypeNode130Slice(b *testing.B) {
	benchSetType(b, make([]Node130, 32))
}

type Node1024 struct {
	Value       [1024]uintptr
	Left, Right *byte
}

func BenchmarkSetTypeNode1024(b *testing.B) {
	benchSetType(b, new(Node1024))
}

func BenchmarkSetTypeNode1024Slice(b *testing.B) {
	benchSetType(b, make([]Node1024, 32))
}

func benchSetType(b *testing.B, x interface{}) {
	v := reflect.ValueOf(x)
	t := v.Type()
	switch t.Kind() {
	case reflect.Ptr:
		b.SetBytes(int64(t.Elem().Size()))
	case reflect.Slice:
		b.SetBytes(int64(t.Elem().Size()) * int64(v.Len()))
	}
	b.ResetTimer()
	runtime.BenchSetType(b.N, x)
}

func BenchmarkAllocation(b *testing.B) {
	type T struct {
		x, y *byte
	}
	ngo := runtime.GOMAXPROCS(0)
	work := make(chan bool, b.N+ngo)
	result := make(chan *T)
	for i := 0; i < b.N; i++ {
		work <- true
	}
	for i := 0; i < ngo; i++ {
		work <- false
	}
	for i := 0; i < ngo; i++ {
		go func() {
			var x *T
			for <-work {
				for i := 0; i < 1000; i++ {
					x = &T{}
				}
			}
			result <- x
		}()
	}
	for i := 0; i < ngo; i++ {
		<-result
	}
}

func TestPrintGC(t *testing.T) {
	if testing.Short() {
		t.Skip("Skipping in short mode")
	}
	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(2))
	done := make(chan bool)
	go func() {
		for {
			select {
			case <-done:
				return
			default:
				runtime.GC()
			}
		}
	}()
	for i := 0; i < 1e4; i++ {
		func() {
			defer print("")
		}()
	}
	close(done)
}

func testTypeSwitch(x interface{}) error {
	switch y := x.(type) {
	case nil:
		// ok
	case error:
		return y
	}
	return nil
}

func testAssert(x interface{}) error {
	if y, ok := x.(error); ok {
		return y
	}
	return nil
}

func testAssertVar(x interface{}) error {
	var y, ok = x.(error)
	if ok {
		return y
	}
	return nil
}

var a bool

//go:noinline
func testIfaceEqual(x interface{}) {
	if x == "abc" {
		a = true
	}
}

func TestPageAccounting(t *testing.T) {
	// Grow the heap in small increments. This used to drop the
	// pages-in-use count below zero because of a rounding
	// mismatch (golang.org/issue/15022).
	const blockSize = 64 << 10
	blocks := make([]*[blockSize]byte, (64<<20)/blockSize)
	for i := range blocks {
		blocks[i] = new([blockSize]byte)
	}

// Check that the running page count matches reality.
	pagesInUse, counted := runtime.CountPagesInUse()
	if pagesInUse != counted {
		t.Fatalf("mheap_.pagesInUse is %d, but direct count is %d", pagesInUse, counted)
	}
}

func TestReadMemStats(t *testing.T) {
	base, slow := runtime.ReadMemStatsSlow()
	if base != slow {
		logDiff(t, "MemStats", reflect.ValueOf(base), reflect.ValueOf(slow))
		t.Fatal("memstats mismatch")
	}
}

func logDiff(t *testing.T, prefix string, got, want reflect.Value) {
	typ := got.Type()
	switch typ.Kind() {
	case reflect.Array, reflect.Slice:
		if got.Len() != want.Len() {
			t.Logf("len(%s): got %v, want %v", prefix, got, want)
			return
		}
		for i := 0; i < got.Len(); i++ {
			logDiff(t, fmt.Sprintf("%s[%d]", prefix, i), got.Index(i), want.Index(i))
		}
	case reflect.Struct:
		for i := 0; i < typ.NumField(); i++ {
			gf, wf := got.Field(i), want.Field(i)
			logDiff(t, prefix+"."+typ.Field(i).Name, gf, wf)
		}
	case reflect.Map:
		t.Fatal("not implemented: logDiff for map")
	default:
		if got.Interface() != want.Interface() {
			t.Logf("%s: got %v, want %v", prefix, got, want)
		}
	}
}

func BenchmarkReadMemStats(b *testing.B) {
	var ms runtime.MemStats
	const heapSize = 100 << 20
	x := make([]*[1024]byte, heapSize/1024)
	for i := range x {
		x[i] = new([1024]byte)
	}
	hugeSink = x

b.ResetTimer()
	for i := 0; i < b.N; i++ {
		runtime.ReadMemStats(&ms)
	}

hugeSink = nil
}

func applyGCLoad(b *testing.B) func() {
	// We’ll apply load to the runtime with maxProcs-1 goroutines
	// and use one more to actually benchmark. It doesn't make sense
	// to try to run this test with only 1 P (that's what
	// BenchmarkReadMemStats is for).
	maxProcs := runtime.GOMAXPROCS(-1)
	if maxProcs == 1 {
		b.Skip("This benchmark can only be run with GOMAXPROCS > 1")
	}

// Code to build a big tree with lots of pointers.
	type node struct {
		children [16]*node
	}
	var buildTree func(depth int) *node
	buildTree = func(depth int) *node {
		tree := new(node)
		if depth != 0 {
			for i := range tree.children {
				tree.children[i] = buildTree(depth - 1)
			}
		}
		return tree
	}

// Keep the GC busy by continuously generating large trees.
	done := make(chan struct{})
	var wg sync.WaitGroup
	for i := 0; i < maxProcs-1; i++ {
		wg.Add(1)
		go func() {
			defer wg.Done()
			var hold *node
		loop:
			for {
				hold = buildTree(5)
				select {
				case <-done:
					break loop
				default:
				}
			}
			runtime.KeepAlive(hold)
		}()
	}
	return func() {
		close(done)
		wg.Wait()
	}
}

func BenchmarkReadMemStatsLatency(b *testing.B) {
	stop := applyGCLoad(b)

// Spend this much time measuring latencies.
	latencies := make([]time.Duration, 0, 1024)

// Run for timeToBench hitting ReadMemStats continuously
	// and measuring the latency.
	b.ResetTimer()
	var ms runtime.MemStats
	for i := 0; i < b.N; i++ {
		// Sleep for a bit, otherwise we're just going to keep
		// stopping the world and no one will get to do anything.
		time.Sleep(100 * time.Millisecond)
		start := time.Now()
		runtime.ReadMemStats(&ms)
		latencies = append(latencies, time.Now().Sub(start))
	}
	// Make sure to stop the timer before we wait! The load created above
	// is very heavy-weight and not easy to stop, so we could end up
	// confusing the benchmarking framework for small b.N.
	b.StopTimer()
	stop()

// Disable the default */op metrics.
	// ns/op doesn't mean anything because it's an average, but we
	// have a sleep in our b.N loop above which skews this significantly.
	b.ReportMetric(0, "ns/op")
	b.ReportMetric(0, "B/op")
	b.ReportMetric(0, "allocs/op")

// Sort latencies then report percentiles.
	sort.Slice(latencies, func(i, j int) bool {
		return latencies[i] < latencies[j]
	})
	b.ReportMetric(float64(latencies[len(latencies)*50/100]), "p50-ns")
	b.ReportMetric(float64(latencies[len(latencies)*90/100]), "p90-ns")
	b.ReportMetric(float64(latencies[len(latencies)*99/100]), "p99-ns")
}

func TestUserForcedGC(t *testing.T) {
	// Test that runtime.GC() triggers a GC even if GOGC=off.
	defer debug.SetGCPercent(debug.SetGCPercent(-1))

var ms1, ms2 runtime.MemStats
	runtime.ReadMemStats(&ms1)
	runtime.GC()
	runtime.ReadMemStats(&ms2)
	if ms1.NumGC == ms2.NumGC {
		t.Fatalf("runtime.GC() did not trigger GC")
	}
	if ms1.NumForcedGC == ms2.NumForcedGC {
		t.Fatalf("runtime.GC() was not accounted in NumForcedGC")
	}
}

func writeBarrierBenchmark(b *testing.B, f func()) {
	runtime.GC()
	var ms runtime.MemStats
	runtime.ReadMemStats(&ms)
	//b.Logf("heap size: %d MB", ms.HeapAlloc>>20)

// Keep GC running continuously during the benchmark, which in
	// turn keeps the write barrier on continuously.
	var stop uint32
	done := make(chan bool)
	go func() {
		for atomic.LoadUint32(&stop) == 0 {
			runtime.GC()
		}
		close(done)
	}()
	defer func() {
		atomic.StoreUint32(&stop, 1)
		<-done
	}()

b.ResetTimer()
	f()
	b.StopTimer()
}

func BenchmarkWriteBarrier(b *testing.B) {
	if runtime.GOMAXPROCS(-1) < 2 {
		// We don't want GC to take our time.
		b.Skip("need GOMAXPROCS >= 2")
	}

// Construct a large tree both so the GC runs for a while and
	// so we have a data structure to manipulate the pointers of.
	type node struct {
		l, r *node
	}
	var wbRoots []*node
	var mkTree func(level int) *node
	mkTree = func(level int) *node {
		if level == 0 {
			return nil
		}
		n := &node{mkTree(level - 1), mkTree(level - 1)}
		if level == 10 {
			// Seed GC with enough early pointers so it
			// doesn't start termination barriers when it
			// only has the top of the tree.
			wbRoots = append(wbRoots, n)
		}
		return n
	}
	const depth = 22 // 64 MB
	root := mkTree(22)

writeBarrierBenchmark(b, func() {
		var stack [depth]*node
		tos := -1

// There are two write barriers per iteration, so i+=2.
		for i := 0; i < b.N; i += 2 {
			if tos == -1 {
				stack[0] = root
				tos = 0
			}

// Perform one step of reversing the tree.
			n := stack[tos]
			if n.l == nil {
				tos--
			} else {
				n.l, n.r = n.r, n.l
				stack[tos] = n.l
				stack[tos+1] = n.r
				tos++
			}

if i%(1<<12) == 0 {
				// Avoid non-preemptible loops (see issue #10958).
				runtime.Gosched()
			}
		}
	})

runtime.KeepAlive(wbRoots)
}

func BenchmarkBulkWriteBarrier(b *testing.B) {
	if runtime.GOMAXPROCS(-1) < 2 {
		// We don't want GC to take our time.
		b.Skip("need GOMAXPROCS >= 2")
	}

// Construct a large set of objects we can copy around.
	const heapSize = 64 << 20
	type obj [16]*byte
	ptrs := make([]*obj, heapSize/unsafe.Sizeof(obj{}))
	for i := range ptrs {
		ptrs[i] = new(obj)
	}

writeBarrierBenchmark(b, func() {
		const blockSize = 1024
		var pos int
		for i := 0; i < b.N; i += blockSize {
			// Rotate block.
			block := ptrs[pos : pos+blockSize]
			first := block[0]
			copy(block, block[1:])
			block[blockSize-1] = first

pos += blockSize
			if pos+blockSize > len(ptrs) {
				pos = 0
			}

runtime.Gosched()
		}
	})

runtime.KeepAlive(ptrs)
}

func BenchmarkScanStackNoLocals(b *testing.B) {
	var ready sync.WaitGroup
	teardown := make(chan bool)
	for j := 0; j < 10; j++ {
		ready.Add(1)
		go func() {
			x := 100000
			countpwg(&x, &ready, teardown)
		}()
	}
	ready.Wait()
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		b.StartTimer()
		runtime.GC()
		runtime.GC()
		b.StopTimer()
	}
	close(teardown)
}

func BenchmarkMSpanCountAlloc(b *testing.B) {
	// Allocate one dummy mspan for the whole benchmark.
	s := runtime.AllocMSpan()
	defer runtime.FreeMSpan(s)

// n is the number of bytes to benchmark against.
	// n must always be a multiple of 8, since gcBits is
	// always rounded up 8 bytes.
	for _, n := range []int{8, 16, 32, 64, 128} {
		b.Run(fmt.Sprintf("bits=%d", n*8), func(b *testing.B) {
			// Initialize a new byte slice with pseduo-random data.
			bits := make([]byte, n)
			rand.Read(bits)

b.ResetTimer()
			for i := 0; i < b.N; i++ {
				runtime.MSpanCountAlloc(s, bits)
			}
		})
	}
}

func countpwg(n *int, ready *sync.WaitGroup, teardown chan bool) {
	if *n == 0 {
		ready.Done()
		<-teardown
		return
	}
	*n--
	countpwg(n, ready, teardown)
}

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