src/runtime/extern.go - go - Git at Google

 // 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 contains operations that interact with Go's runtime system,
 such as functions to control goroutines. It also includes the low-level type information
 used by the reflect package; see reflect's documentation for the programmable
 interface to the run-time type system.

 # Environment Variables

 The following environment variables ($name or %name%, depending on the host
 operating system) control the run-time behavior of Go programs. The meanings
 and use may change from release to release.

 The GOGC variable sets the initial garbage collection target percentage.
 A collection is triggered when the ratio of freshly allocated data to live data
 remaining after the previous collection reaches this percentage. The default
 is GOGC=100. Setting GOGC=off disables the garbage collector entirely.
 [runtime/debug.SetGCPercent] allows changing this percentage at run time.

 The GOMEMLIMIT variable sets a soft memory limit for the runtime. This memory limit
 includes the Go heap and all other memory managed by the runtime, and excludes
 external memory sources such as mappings of the binary itself, memory managed in
 other languages, and memory held by the operating system on behalf of the Go
 program. GOMEMLIMIT is a numeric value in bytes with an optional unit suffix.
 The supported suffixes include B, KiB, MiB, GiB, and TiB. These suffixes
 represent quantities of bytes as defined by the IEC 80000-13 standard. That is,
 they are based on powers of two: KiB means 2^10 bytes, MiB means 2^20 bytes,
 and so on. The default setting is math.MaxInt64, which effectively disables the
 memory limit. [runtime/debug.SetMemoryLimit] allows changing this limit at run
 time.

 The GODEBUG variable controls debugging variables within the runtime.
 It is a comma-separated list of name=val pairs setting these named variables:

 	allocfreetrace: setting allocfreetrace=1 causes every allocation to be
 	profiled and a stack trace printed on each object's allocation and free.

 	clobberfree: setting clobberfree=1 causes the garbage collector to
 	clobber the memory content of an object with bad content when it frees
 	the object.

 	cpu.*: cpu.all=off disables the use of all optional instruction set extensions.
 	cpu.extension=off disables use of instructions from the specified instruction set extension.
 	extension is the lower case name for the instruction set extension such as sse41 or avx
 	as listed in internal/cpu package. As an example cpu.avx=off disables runtime detection
 	and thereby use of AVX instructions.

 	cgocheck: setting cgocheck=0 disables all checks for packages
 	using cgo to incorrectly pass Go pointers to non-Go code.
 	Setting cgocheck=1 (the default) enables relatively cheap
 	checks that may miss some errors. A more complete, but slow,
 	cgocheck mode can be enabled using GOEXPERIMENT (which
 	requires a rebuild), see https://pkg.go.dev/internal/goexperiment for details.

 	dontfreezetheworld: by default, the start of a fatal panic or throw
 	"freezes the world", preempting all threads to stop all running
 	goroutines, which makes it possible to traceback all goroutines, and
 	keeps their state close to the point of panic. Setting
 	dontfreezetheworld=1 disables this preemption, allowing goroutines to
 	continue executing during panic processing. Note that goroutines that
 	naturally enter the scheduler will still stop. This can be useful when
 	debugging the runtime scheduler, as freezetheworld perturbs scheduler
 	state and thus may hide problems.

 	efence: setting efence=1 causes the allocator to run in a mode
 	where each object is allocated on a unique page and addresses are
 	never recycled.

 	gccheckmark: setting gccheckmark=1 enables verification of the
 	garbage collector's concurrent mark phase by performing a
 	second mark pass while the world is stopped.  If the second
 	pass finds a reachable object that was not found by concurrent
 	mark, the garbage collector will panic.

 	gcpacertrace: setting gcpacertrace=1 causes the garbage collector to
 	print information about the internal state of the concurrent pacer.

 	gcshrinkstackoff: setting gcshrinkstackoff=1 disables moving goroutines
 	onto smaller stacks. In this mode, a goroutine's stack can only grow.

 	gcstoptheworld: setting gcstoptheworld=1 disables concurrent garbage collection,
 	making every garbage collection a stop-the-world event. Setting gcstoptheworld=2
 	also disables concurrent sweeping after the garbage collection finishes.

 	gctrace: setting gctrace=1 causes the garbage collector to emit a single line to standard
 	error at each collection, summarizing the amount of memory collected and the
 	length of the pause. The format of this line is subject to change. Included in
 	the explanation below is also the relevant runtime/metrics metric for each field.
 	Currently, it is:
 		gc # @#s #%: #+#+# ms clock, #+#/#/#+# ms cpu, #->#-># MB, # MB goal, # MB stacks, #MB globals, # P
 	where the fields are as follows:
 		gc #         the GC number, incremented at each GC
 		@#s          time in seconds since program start
 		#%           percentage of time spent in GC since program start
 		#+...+#      wall-clock/CPU times for the phases of the GC
 		#->#-># MB   heap size at GC start, at GC end, and live heap, or /gc/scan/heap:bytes
 		# MB goal    goal heap size, or /gc/heap/goal:bytes
 		# MB stacks  estimated scannable stack size, or /gc/scan/stack:bytes
 		# MB globals scannable global size, or /gc/scan/globals:bytes
 		# P          number of processors used, or /sched/gomaxprocs:threads
 	The phases are stop-the-world (STW) sweep termination, concurrent
 	mark and scan, and STW mark termination. The CPU times
 	for mark/scan are broken down in to assist time (GC performed in
 	line with allocation), background GC time, and idle GC time.
 	If the line ends with "(forced)", this GC was forced by a
 	runtime.GC() call.

 	harddecommit: setting harddecommit=1 causes memory that is returned to the OS to
 	also have protections removed on it. This is the only mode of operation on Windows,
 	but is helpful in debugging scavenger-related issues on other platforms. Currently,
 	only supported on Linux.

 	inittrace: setting inittrace=1 causes the runtime to emit a single line to standard
 	error for each package with init work, summarizing the execution time and memory
 	allocation. No information is printed for inits executed as part of plugin loading
 	and for packages without both user defined and compiler generated init work.
 	The format of this line is subject to change. Currently, it is:
 		init # @#ms, # ms clock, # bytes, # allocs
 	where the fields are as follows:
 		init #      the package name
 		@# ms       time in milliseconds when the init started since program start
 		# clock     wall-clock time for package initialization work
 		# bytes     memory allocated on the heap
 		# allocs    number of heap allocations

 	madvdontneed: setting madvdontneed=0 will use MADV_FREE
 	instead of MADV_DONTNEED on Linux when returning memory to the
 	kernel. This is more efficient, but means RSS numbers will
 	drop only when the OS is under memory pressure. On the BSDs and
 	Illumos/Solaris, setting madvdontneed=1 will use MADV_DONTNEED instead
 	of MADV_FREE. This is less efficient, but causes RSS numbers to drop
 	more quickly.

 	memprofilerate: setting memprofilerate=X will update the value of runtime.MemProfileRate.
 	When set to 0 memory profiling is disabled.  Refer to the description of
 	MemProfileRate for the default value.

 	pagetrace: setting pagetrace=/path/to/file will write out a trace of page events
 	that can be viewed, analyzed, and visualized using the x/debug/cmd/pagetrace tool.
 	Build your program with GOEXPERIMENT=pagetrace to enable this functionality. Do not
 	enable this functionality if your program is a setuid binary as it introduces a security
 	risk in that scenario. Currently not supported on Windows, plan9 or js/wasm. Setting this
 	option for some applications can produce large traces, so use with care.

 	invalidptr: invalidptr=1 (the default) causes the garbage collector and stack
 	copier to crash the program if an invalid pointer value (for example, 1)
 	is found in a pointer-typed location. Setting invalidptr=0 disables this check.
 	This should only be used as a temporary workaround to diagnose buggy code.
 	The real fix is to not store integers in pointer-typed locations.

 	sbrk: setting sbrk=1 replaces the memory allocator and garbage collector
 	with a trivial allocator that obtains memory from the operating system and
 	never reclaims any memory.

 	scavtrace: setting scavtrace=1 causes the runtime to emit a single line to standard
 	error, roughly once per GC cycle, summarizing the amount of work done by the
 	scavenger as well as the total amount of memory returned to the operating system
 	and an estimate of physical memory utilization. The format of this line is subject
 	to change, but currently it is:
 		scav # KiB work (bg), # KiB work (eager), # KiB total, #% util
 	where the fields are as follows:
 		# KiB work (bg)    the amount of memory returned to the OS in the background since
 		                   the last line
 		# KiB work (eager) the amount of memory returned to the OS eagerly since the last line
 		# KiB now          the amount of address space currently returned to the OS
 		#% util            the fraction of all unscavenged heap memory which is in-use
 	If the line ends with "(forced)", then scavenging was forced by a
 	debug.FreeOSMemory() call.

 	scheddetail: setting schedtrace=X and scheddetail=1 causes the scheduler to emit
 	detailed multiline info every X milliseconds, describing state of the scheduler,
 	processors, threads and goroutines.

 	schedtrace: setting schedtrace=X causes the scheduler to emit a single line to standard
 	error every X milliseconds, summarizing the scheduler state.

 	tracebackancestors: setting tracebackancestors=N extends tracebacks with the stacks at
 	which goroutines were created, where N limits the number of ancestor goroutines to
 	report. This also extends the information returned by runtime.Stack. Ancestor's goroutine
 	IDs will refer to the ID of the goroutine at the time of creation; it's possible for this
 	ID to be reused for another goroutine. Setting N to 0 will report no ancestry information.

 	tracefpunwindoff: setting tracefpunwindoff=1 forces the execution tracer to
 	use the runtime's default stack unwinder instead of frame pointer unwinding.
 	This increases tracer overhead, but could be helpful as a workaround or for
 	debugging unexpected regressions caused by frame pointer unwinding.

 	asyncpreemptoff: asyncpreemptoff=1 disables signal-based
 	asynchronous goroutine preemption. This makes some loops
 	non-preemptible for long periods, which may delay GC and
 	goroutine scheduling. This is useful for debugging GC issues
 	because it also disables the conservative stack scanning used
 	for asynchronously preempted goroutines.

 The net and net/http packages also refer to debugging variables in GODEBUG.
 See the documentation for those packages for details.

 The GOMAXPROCS variable limits the number of operating system threads that
 can execute user-level Go code simultaneously. There is no limit to the number of threads
 that can be blocked in system calls on behalf of Go code; those do not count against
 the GOMAXPROCS limit. This package's GOMAXPROCS function queries and changes
 the limit.

 The GORACE variable configures the race detector, for programs built using -race.
 See https://golang.org/doc/articles/race_detector.html for details.

 The GOTRACEBACK variable controls the amount of output generated when a Go
 program fails due to an unrecovered panic or an unexpected runtime condition.
 By default, a failure prints a stack trace for the current goroutine,
 eliding functions internal to the run-time system, and then exits with exit code 2.
 The failure prints stack traces for all goroutines if there is no current goroutine
 or the failure is internal to the run-time.
 GOTRACEBACK=none omits the goroutine stack traces entirely.
 GOTRACEBACK=single (the default) behaves as described above.
 GOTRACEBACK=all adds stack traces for all user-created goroutines.
 GOTRACEBACK=system is like “all” but adds stack frames for run-time functions
 and shows goroutines created internally by the run-time.
 GOTRACEBACK=crash is like “system” but crashes in an operating system-specific
 manner instead of exiting. For example, on Unix systems, the crash raises
 SIGABRT to trigger a core dump.
 GOTRACEBACK=wer is like “crash” but doesn't disable Windows Error Reporting (WER).
 For historical reasons, the GOTRACEBACK settings 0, 1, and 2 are synonyms for
 none, all, and system, respectively.
 The runtime/debug package's SetTraceback function allows increasing the
 amount of output at run time, but it cannot reduce the amount below that
 specified by the environment variable.
 See https://golang.org/pkg/runtime/debug/#SetTraceback.

 The GOARCH, GOOS, GOPATH, and GOROOT environment variables complete
 the set of Go environment variables. They influence the building of Go programs
 (see https://golang.org/cmd/go and https://golang.org/pkg/go/build).
 GOARCH, GOOS, and GOROOT are recorded at compile time and made available by
 constants or functions in this package, but they do not influence the execution
 of the run-time system.

 # Security

 On Unix platforms, Go's runtime system behaves slightly differently when a
 binary is setuid/setgid or executed with setuid/setgid-like properties, in order
 to prevent dangerous behaviors. On Linux this is determined by checking for the
 AT_SECURE flag in the auxiliary vector, on the BSDs and Solaris/Illumos it is
 determined by checking the issetugid syscall, and on AIX it is determined by
 checking if the uid/gid match the effective uid/gid.

 When the runtime determines the binary is setuid/setgid-like, it does three main
 things:
   - The standard input/output file descriptors (0, 1, 2) are checked to be open.
     If any of them are closed, they are opened pointing at /dev/null.
   - The value of the GOTRACEBACK environment variable is set to 'none'.
   - When a signal is received that terminates the program, or the program
     encounters an unrecoverable panic that would otherwise override the value
     of GOTRACEBACK, the goroutine stack, registers, and other memory related
     information are omitted.
 */
 package runtime

 import (
 	"internal/goarch"
 	"internal/goos"
 )

 // Caller reports file and line number information about function invocations on
 // the calling goroutine's stack. The argument skip is the number of stack frames
 // to ascend, with 0 identifying the caller of Caller.  (For historical reasons the
 // meaning of skip differs between Caller and Callers.) The return values report the
 // program counter, file name, and line number within the file of the corresponding
 // call. The boolean ok is false if it was not possible to recover the information.
 func Caller(skip int) (pc uintptr, file string, line int, ok bool) {
 	rpc := make([]uintptr, 1)
 	n := callers(skip+1, rpc[:])
 	if n < 1 {
 		return
 	}
 	frame, _ := CallersFrames(rpc).Next()
 	return frame.PC, frame.File, frame.Line, frame.PC != 0
 }

 // Callers fills the slice pc with the return program counters of function invocations
 // on the calling goroutine's stack. The argument skip is the number of stack frames
 // to skip before recording in pc, with 0 identifying the frame for Callers itself and
 // 1 identifying the caller of Callers.
 // It returns the number of entries written to pc.
 //
 // To translate these PCs into symbolic information such as function
 // names and line numbers, use CallersFrames. CallersFrames accounts
 // for inlined functions and adjusts the return program counters into
 // call program counters. Iterating over the returned slice of PCs
 // directly is discouraged, as is using FuncForPC on any of the
 // returned PCs, since these cannot account for inlining or return
 // program counter adjustment.
 func Callers(skip int, pc []uintptr) int {
 	// runtime.callers uses pc.array==nil as a signal
 	// to print a stack trace. Pick off 0-length pc here
 	// so that we don't let a nil pc slice get to it.
 	if len(pc) == 0 {
 		return 0
 	}
 	return callers(skip, pc)
 }

 var defaultGOROOT string // set by cmd/link

 // GOROOT returns the root of the Go tree. It uses the
 // GOROOT environment variable, if set at process start,
 // or else the root used during the Go build.
 func GOROOT() string {
 	s := gogetenv("GOROOT")
 	if s != "" {
 		return s
 	}
 	return defaultGOROOT
 }

 // buildVersion is the Go tree's version string at build time.
 //
 // If any GOEXPERIMENTs are set to non-default values, it will include
 // "X:<GOEXPERIMENT>".
 //
 // This is set by the linker.
 //
 // This is accessed by "go version <binary>".
 var buildVersion string

 // Version returns the Go tree's version string.
 // It is either the commit hash and date at the time of the build or,
 // when possible, a release tag like "go1.3".
 func Version() string {
 	return buildVersion
 }

 // GOOS is the running program's operating system target:
 // one of darwin, freebsd, linux, and so on.
 // To view possible combinations of GOOS and GOARCH, run "go tool dist list".
 const GOOS string = goos.GOOS

 // GOARCH is the running program's architecture target:
 // one of 386, amd64, arm, s390x, and so on.
 const GOARCH string = goarch.GOARCH
	// 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 contains operations that interact with Go's runtime system,
	such as functions to control goroutines. It also includes the low-level type information
	used by the reflect package; see reflect's documentation for the programmable
	interface to the run-time type system.

	# Environment Variables

	The following environment variables ($name or %name%, depending on the host
	operating system) control the run-time behavior of Go programs. The meanings
	and use may change from release to release.

	The GOGC variable sets the initial garbage collection target percentage.
	A collection is triggered when the ratio of freshly allocated data to live data
	remaining after the previous collection reaches this percentage. The default
	is GOGC=100. Setting GOGC=off disables the garbage collector entirely.
	[runtime/debug.SetGCPercent] allows changing this percentage at run time.

	The GOMEMLIMIT variable sets a soft memory limit for the runtime. This memory limit
	includes the Go heap and all other memory managed by the runtime, and excludes
	external memory sources such as mappings of the binary itself, memory managed in
	other languages, and memory held by the operating system on behalf of the Go
	program. GOMEMLIMIT is a numeric value in bytes with an optional unit suffix.
	The supported suffixes include B, KiB, MiB, GiB, and TiB. These suffixes
	represent quantities of bytes as defined by the IEC 80000-13 standard. That is,
	they are based on powers of two: KiB means 2^10 bytes, MiB means 2^20 bytes,
	and so on. The default setting is math.MaxInt64, which effectively disables the
	memory limit. [runtime/debug.SetMemoryLimit] allows changing this limit at run
	time.

	The GODEBUG variable controls debugging variables within the runtime.
	It is a comma-separated list of name=val pairs setting these named variables:

	allocfreetrace: setting allocfreetrace=1 causes every allocation to be
	profiled and a stack trace printed on each object's allocation and free.

	clobberfree: setting clobberfree=1 causes the garbage collector to
	clobber the memory content of an object with bad content when it frees
	the object.

	cpu.*: cpu.all=off disables the use of all optional instruction set extensions.
	cpu.extension=off disables use of instructions from the specified instruction set extension.
	extension is the lower case name for the instruction set extension such as sse41 or avx
	as listed in internal/cpu package. As an example cpu.avx=off disables runtime detection
	and thereby use of AVX instructions.

	cgocheck: setting cgocheck=0 disables all checks for packages
	using cgo to incorrectly pass Go pointers to non-Go code.
	Setting cgocheck=1 (the default) enables relatively cheap
	checks that may miss some errors. A more complete, but slow,
	cgocheck mode can be enabled using GOEXPERIMENT (which
	requires a rebuild), see https://pkg.go.dev/internal/goexperiment for details.

	dontfreezetheworld: by default, the start of a fatal panic or throw
	"freezes the world", preempting all threads to stop all running
	goroutines, which makes it possible to traceback all goroutines, and
	keeps their state close to the point of panic. Setting
	dontfreezetheworld=1 disables this preemption, allowing goroutines to
	continue executing during panic processing. Note that goroutines that
	naturally enter the scheduler will still stop. This can be useful when
	debugging the runtime scheduler, as freezetheworld perturbs scheduler
	state and thus may hide problems.

	efence: setting efence=1 causes the allocator to run in a mode
	where each object is allocated on a unique page and addresses are
	never recycled.

	gccheckmark: setting gccheckmark=1 enables verification of the
	garbage collector's concurrent mark phase by performing a
	second mark pass while the world is stopped. If the second
	pass finds a reachable object that was not found by concurrent
	mark, the garbage collector will panic.

	gcpacertrace: setting gcpacertrace=1 causes the garbage collector to
	print information about the internal state of the concurrent pacer.

	gcshrinkstackoff: setting gcshrinkstackoff=1 disables moving goroutines
	onto smaller stacks. In this mode, a goroutine's stack can only grow.

	gcstoptheworld: setting gcstoptheworld=1 disables concurrent garbage collection,
	making every garbage collection a stop-the-world event. Setting gcstoptheworld=2
	also disables concurrent sweeping after the garbage collection finishes.

	gctrace: setting gctrace=1 causes the garbage collector to emit a single line to standard
	error at each collection, summarizing the amount of memory collected and the
	length of the pause. The format of this line is subject to change. Included in
	the explanation below is also the relevant runtime/metrics metric for each field.
	Currently, it is:
	gc # @#s #%: #+#+# ms clock, #+#/#/#+# ms cpu, #->#-># MB, # MB goal, # MB stacks, #MB globals, # P
	where the fields are as follows:
	gc # the GC number, incremented at each GC
	@#s time in seconds since program start
	#% percentage of time spent in GC since program start
	#+...+# wall-clock/CPU times for the phases of the GC
	#->#-># MB heap size at GC start, at GC end, and live heap, or /gc/scan/heap:bytes
	# MB goal goal heap size, or /gc/heap/goal:bytes
	# MB stacks estimated scannable stack size, or /gc/scan/stack:bytes
	# MB globals scannable global size, or /gc/scan/globals:bytes
	# P number of processors used, or /sched/gomaxprocs:threads
	The phases are stop-the-world (STW) sweep termination, concurrent
	mark and scan, and STW mark termination. The CPU times
	for mark/scan are broken down in to assist time (GC performed in
	line with allocation), background GC time, and idle GC time.
	If the line ends with "(forced)", this GC was forced by a
	runtime.GC() call.

	harddecommit: setting harddecommit=1 causes memory that is returned to the OS to
	also have protections removed on it. This is the only mode of operation on Windows,
	but is helpful in debugging scavenger-related issues on other platforms. Currently,
	only supported on Linux.

	inittrace: setting inittrace=1 causes the runtime to emit a single line to standard
	error for each package with init work, summarizing the execution time and memory
	allocation. No information is printed for inits executed as part of plugin loading
	and for packages without both user defined and compiler generated init work.
	The format of this line is subject to change. Currently, it is:
	init # @#ms, # ms clock, # bytes, # allocs
	where the fields are as follows:
	init # the package name
	@# ms time in milliseconds when the init started since program start
	# clock wall-clock time for package initialization work
	# bytes memory allocated on the heap
	# allocs number of heap allocations

	madvdontneed: setting madvdontneed=0 will use MADV_FREE
	instead of MADV_DONTNEED on Linux when returning memory to the
	kernel. This is more efficient, but means RSS numbers will
	drop only when the OS is under memory pressure. On the BSDs and
	Illumos/Solaris, setting madvdontneed=1 will use MADV_DONTNEED instead
	of MADV_FREE. This is less efficient, but causes RSS numbers to drop
	more quickly.

	memprofilerate: setting memprofilerate=X will update the value of runtime.MemProfileRate.
	When set to 0 memory profiling is disabled. Refer to the description of
	MemProfileRate for the default value.

	pagetrace: setting pagetrace=/path/to/file will write out a trace of page events
	that can be viewed, analyzed, and visualized using the x/debug/cmd/pagetrace tool.
	Build your program with GOEXPERIMENT=pagetrace to enable this functionality. Do not
	enable this functionality if your program is a setuid binary as it introduces a security
	risk in that scenario. Currently not supported on Windows, plan9 or js/wasm. Setting this
	option for some applications can produce large traces, so use with care.

	invalidptr: invalidptr=1 (the default) causes the garbage collector and stack
	copier to crash the program if an invalid pointer value (for example, 1)
	is found in a pointer-typed location. Setting invalidptr=0 disables this check.
	This should only be used as a temporary workaround to diagnose buggy code.
	The real fix is to not store integers in pointer-typed locations.

	sbrk: setting sbrk=1 replaces the memory allocator and garbage collector
	with a trivial allocator that obtains memory from the operating system and
	never reclaims any memory.

	scavtrace: setting scavtrace=1 causes the runtime to emit a single line to standard
	error, roughly once per GC cycle, summarizing the amount of work done by the
	scavenger as well as the total amount of memory returned to the operating system
	and an estimate of physical memory utilization. The format of this line is subject
	to change, but currently it is:
	scav # KiB work (bg), # KiB work (eager), # KiB total, #% util
	where the fields are as follows:
	# KiB work (bg) the amount of memory returned to the OS in the background since
	the last line
	# KiB work (eager) the amount of memory returned to the OS eagerly since the last line
	# KiB now the amount of address space currently returned to the OS
	#% util the fraction of all unscavenged heap memory which is in-use
	If the line ends with "(forced)", then scavenging was forced by a
	debug.FreeOSMemory() call.

	scheddetail: setting schedtrace=X and scheddetail=1 causes the scheduler to emit
	detailed multiline info every X milliseconds, describing state of the scheduler,
	processors, threads and goroutines.

	schedtrace: setting schedtrace=X causes the scheduler to emit a single line to standard
	error every X milliseconds, summarizing the scheduler state.

	tracebackancestors: setting tracebackancestors=N extends tracebacks with the stacks at
	which goroutines were created, where N limits the number of ancestor goroutines to
	report. This also extends the information returned by runtime.Stack. Ancestor's goroutine
	IDs will refer to the ID of the goroutine at the time of creation; it's possible for this
	ID to be reused for another goroutine. Setting N to 0 will report no ancestry information.

	tracefpunwindoff: setting tracefpunwindoff=1 forces the execution tracer to
	use the runtime's default stack unwinder instead of frame pointer unwinding.
	This increases tracer overhead, but could be helpful as a workaround or for
	debugging unexpected regressions caused by frame pointer unwinding.

	asyncpreemptoff: asyncpreemptoff=1 disables signal-based
	asynchronous goroutine preemption. This makes some loops
	non-preemptible for long periods, which may delay GC and
	goroutine scheduling. This is useful for debugging GC issues
	because it also disables the conservative stack scanning used
	for asynchronously preempted goroutines.

	The net and net/http packages also refer to debugging variables in GODEBUG.
	See the documentation for those packages for details.

	The GOMAXPROCS variable limits the number of operating system threads that
	can execute user-level Go code simultaneously. There is no limit to the number of threads
	that can be blocked in system calls on behalf of Go code; those do not count against
	the GOMAXPROCS limit. This package's GOMAXPROCS function queries and changes
	the limit.

	The GORACE variable configures the race detector, for programs built using -race.
	See https://golang.org/doc/articles/race_detector.html for details.

	The GOTRACEBACK variable controls the amount of output generated when a Go
	program fails due to an unrecovered panic or an unexpected runtime condition.
	By default, a failure prints a stack trace for the current goroutine,
	eliding functions internal to the run-time system, and then exits with exit code 2.
	The failure prints stack traces for all goroutines if there is no current goroutine
	or the failure is internal to the run-time.
	GOTRACEBACK=none omits the goroutine stack traces entirely.
	GOTRACEBACK=single (the default) behaves as described above.
	GOTRACEBACK=all adds stack traces for all user-created goroutines.
	GOTRACEBACK=system is like “all” but adds stack frames for run-time functions
	and shows goroutines created internally by the run-time.
	GOTRACEBACK=crash is like “system” but crashes in an operating system-specific
	manner instead of exiting. For example, on Unix systems, the crash raises
	SIGABRT to trigger a core dump.
	GOTRACEBACK=wer is like “crash” but doesn't disable Windows Error Reporting (WER).
	For historical reasons, the GOTRACEBACK settings 0, 1, and 2 are synonyms for
	none, all, and system, respectively.
	The runtime/debug package's SetTraceback function allows increasing the
	amount of output at run time, but it cannot reduce the amount below that
	specified by the environment variable.
	See https://golang.org/pkg/runtime/debug/#SetTraceback.

	The GOARCH, GOOS, GOPATH, and GOROOT environment variables complete
	the set of Go environment variables. They influence the building of Go programs
	(see https://golang.org/cmd/go and https://golang.org/pkg/go/build).
	GOARCH, GOOS, and GOROOT are recorded at compile time and made available by
	constants or functions in this package, but they do not influence the execution
	of the run-time system.

	# Security

	On Unix platforms, Go's runtime system behaves slightly differently when a
	binary is setuid/setgid or executed with setuid/setgid-like properties, in order
	to prevent dangerous behaviors. On Linux this is determined by checking for the
	AT_SECURE flag in the auxiliary vector, on the BSDs and Solaris/Illumos it is
	determined by checking the issetugid syscall, and on AIX it is determined by
	checking if the uid/gid match the effective uid/gid.

	When the runtime determines the binary is setuid/setgid-like, it does three main
	things:
	- The standard input/output file descriptors (0, 1, 2) are checked to be open.
	If any of them are closed, they are opened pointing at /dev/null.
	- The value of the GOTRACEBACK environment variable is set to 'none'.
	- When a signal is received that terminates the program, or the program
	encounters an unrecoverable panic that would otherwise override the value
	of GOTRACEBACK, the goroutine stack, registers, and other memory related
	information are omitted.
	*/
	package runtime

	import (
	"internal/goarch"
	"internal/goos"
	)

	// Caller reports file and line number information about function invocations on
	// the calling goroutine's stack. The argument skip is the number of stack frames
	// to ascend, with 0 identifying the caller of Caller. (For historical reasons the
	// meaning of skip differs between Caller and Callers.) The return values report the
	// program counter, file name, and line number within the file of the corresponding
	// call. The boolean ok is false if it was not possible to recover the information.
	func Caller(skip int) (pc uintptr, file string, line int, ok bool) {
	rpc := make([]uintptr, 1)
	n := callers(skip+1, rpc[:])
	if n < 1 {
	return
	}
	frame, _ := CallersFrames(rpc).Next()
	return frame.PC, frame.File, frame.Line, frame.PC != 0
	}

	// Callers fills the slice pc with the return program counters of function invocations
	// on the calling goroutine's stack. The argument skip is the number of stack frames
	// to skip before recording in pc, with 0 identifying the frame for Callers itself and
	// 1 identifying the caller of Callers.
	// It returns the number of entries written to pc.
	//
	// To translate these PCs into symbolic information such as function
	// names and line numbers, use CallersFrames. CallersFrames accounts
	// for inlined functions and adjusts the return program counters into
	// call program counters. Iterating over the returned slice of PCs
	// directly is discouraged, as is using FuncForPC on any of the
	// returned PCs, since these cannot account for inlining or return
	// program counter adjustment.
	func Callers(skip int, pc []uintptr) int {
	// runtime.callers uses pc.array==nil as a signal
	// to print a stack trace. Pick off 0-length pc here
	// so that we don't let a nil pc slice get to it.
	if len(pc) == 0 {
	return 0
	}
	return callers(skip, pc)
	}

	var defaultGOROOT string // set by cmd/link

	// GOROOT returns the root of the Go tree. It uses the
	// GOROOT environment variable, if set at process start,
	// or else the root used during the Go build.
	func GOROOT() string {
	s := gogetenv("GOROOT")
	if s != "" {
	return s
	}
	return defaultGOROOT
	}

	// buildVersion is the Go tree's version string at build time.
	//
	// If any GOEXPERIMENTs are set to non-default values, it will include
	// "X:<GOEXPERIMENT>".
	//
	// This is set by the linker.
	//
	// This is accessed by "go version <binary>".
	var buildVersion string

	// Version returns the Go tree's version string.
	// It is either the commit hash and date at the time of the build or,
	// when possible, a release tag like "go1.3".
	func Version() string {
	return buildVersion
	}

	// GOOS is the running program's operating system target:
	// one of darwin, freebsd, linux, and so on.
	// To view possible combinations of GOOS and GOARCH, run "go tool dist list".
	const GOOS string = goos.GOOS

	// GOARCH is the running program's architecture target:
	// one of 386, amd64, arm, s390x, and so on.
	const GOARCH string = goarch.GOARCH