2014-11-18 11:38:23 -05:00
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// created by cgo -cdefs and then converted to Go
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// cgo -cdefs defs_linux.go defs3_linux.go
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package runtime
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2021-09-29 17:35:27 -07:00
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import "unsafe"
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2014-11-18 11:38:23 -05:00
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const (
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_EINTR = 0x4
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_EAGAIN = 0xb
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_ENOMEM = 0xc
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_PROT_NONE = 0x0
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_PROT_READ = 0x1
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_PROT_WRITE = 0x2
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_PROT_EXEC = 0x4
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_MAP_ANON = 0x20
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_MAP_PRIVATE = 0x2
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_MAP_FIXED = 0x10
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2015-02-23 13:58:05 -08:00
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_MADV_DONTNEED = 0x4
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2018-09-14 09:57:06 +02:00
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_MADV_FREE = 0x8
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2015-02-23 13:58:05 -08:00
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_MADV_HUGEPAGE = 0xe
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_MADV_NOHUGEPAGE = 0xf
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2014-11-18 11:38:23 -05:00
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_SA_RESTART = 0x10000000
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_SA_ONSTACK = 0x8000000
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_SA_SIGINFO = 0x4
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2021-08-13 08:34:25 -07:00
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_SI_KERNEL = 0x80
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_SI_TIMER = -0x2
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2014-11-18 11:38:23 -05:00
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_SIGHUP = 0x1
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_SIGINT = 0x2
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_SIGQUIT = 0x3
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_SIGILL = 0x4
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_SIGTRAP = 0x5
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_SIGABRT = 0x6
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_SIGBUS = 0x7
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_SIGFPE = 0x8
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_SIGKILL = 0x9
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_SIGUSR1 = 0xa
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_SIGSEGV = 0xb
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_SIGUSR2 = 0xc
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_SIGPIPE = 0xd
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_SIGALRM = 0xe
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_SIGSTKFLT = 0x10
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_SIGCHLD = 0x11
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_SIGCONT = 0x12
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_SIGSTOP = 0x13
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_SIGTSTP = 0x14
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_SIGTTIN = 0x15
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_SIGTTOU = 0x16
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_SIGURG = 0x17
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_SIGXCPU = 0x18
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_SIGXFSZ = 0x19
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_SIGVTALRM = 0x1a
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_SIGPROF = 0x1b
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_SIGWINCH = 0x1c
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_SIGIO = 0x1d
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_SIGPWR = 0x1e
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_SIGSYS = 0x1f
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runtime, syscall: reimplement AllThreadsSyscall using only signals.
In issue 50113, we see that a thread blocked in a system call can result
in a hang of AllThreadsSyscall. To resolve this, we must send a signal
to these threads to knock them out of the system call long enough to run
the per-thread syscall.
Stepping back, if we need to send signals anyway, it should be possible
to implement this entire mechanism on top of signals. This CL does so,
vastly simplifying the mechanism, both as a direct result of
newly-unnecessary code as well as some ancillary simplifications to make
things simpler to follow.
Major changes:
* The rest of the mechanism is moved to os_linux.go, with fields in mOS
instead of m itself.
* 'Fixup' fields and functions are renamed to 'perThreadSyscall' so they
are more precise about their purpose.
* Rather than getting passed a closure, doAllThreadsSyscall takes the
syscall number and arguments. This avoids a lot of hairy behavior:
* The closure may potentially only be live in fields in the M,
hidden from the GC. Not necessary with no closure.
* The need to loan out the race context. A direct RawSyscall6 call
does not require any race context.
* The closure previously conditionally panicked in strange
locations, like a signal handler. Now we simply throw.
* All manual fixup synchronization with mPark, sysmon, templateThread,
sigqueue, etc is gone. The core approach is much simpler:
doAllThreadsSyscall sends a signal to every thread in allm, which
executes the system call from the signal handler. We use (SIGRTMIN +
1), aka SIGSETXID, the same signal used by glibc for this purpose. As
such, we are careful to only handle this signal on non-cgo binaries.
Synchronization with thread creation is a key part of this CL. The
comment near the top of doAllThreadsSyscall describes the required
synchronization semantics and how they are achieved.
Note that current use of allocmLock protects the state mutations of allm
that are also protected by sched.lock. allocmLock is used instead of
sched.lock simply to avoid holding sched.lock for so long.
Fixes #50113
Change-Id: Ic7ea856dc66cf711731540a54996e08fc986ce84
Reviewed-on: https://go-review.googlesource.com/c/go/+/383434
Reviewed-by: Austin Clements <austin@google.com>
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-02-04 17:15:28 -05:00
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_SIGRTMIN = 0x20
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2014-11-18 11:38:23 -05:00
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_FPE_INTDIV = 0x1
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_FPE_INTOVF = 0x2
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_FPE_FLTDIV = 0x3
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_FPE_FLTOVF = 0x4
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_FPE_FLTUND = 0x5
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_FPE_FLTRES = 0x6
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_FPE_FLTINV = 0x7
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_FPE_FLTSUB = 0x8
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_BUS_ADRALN = 0x1
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_BUS_ADRERR = 0x2
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_BUS_OBJERR = 0x3
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_SEGV_MAPERR = 0x1
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_SEGV_ACCERR = 0x2
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_ITIMER_REAL = 0x0
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_ITIMER_VIRTUAL = 0x1
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_ITIMER_PROF = 0x2
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2021-08-13 08:34:25 -07:00
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_CLOCK_THREAD_CPUTIME_ID = 0x3
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_SIGEV_THREAD_ID = 0x4
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2014-11-18 11:38:23 -05:00
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)
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//struct Sigset {
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// uint64 sig[1];
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//};
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//typedef uint64 Sigset;
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type timespec struct {
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tv_sec int64
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tv_nsec int64
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}
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2019-03-13 18:56:37 -07:00
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//go:nosplit
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func (ts *timespec) setNsec(ns int64) {
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ts.tv_sec = ns / 1e9
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ts.tv_nsec = ns % 1e9
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2014-11-18 15:19:48 -05:00
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}
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2014-11-18 11:38:23 -05:00
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type timeval struct {
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tv_sec int64
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tv_usec int64
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}
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2014-11-18 15:19:48 -05:00
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func (tv *timeval) set_usec(x int32) {
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tv.tv_usec = int64(x)
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}
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2014-11-18 11:38:23 -05:00
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type sigactiont struct {
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sa_handler uintptr
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sa_flags uint64
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sa_restorer uintptr
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sa_mask uint64
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}
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2021-09-29 17:35:27 -07:00
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type siginfoFields struct {
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2014-11-19 14:56:49 -05:00
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si_signo int32
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si_errno int32
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si_code int32
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// below here is a union; si_addr is the only field we use
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si_addr uint64
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2014-11-18 11:38:23 -05:00
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}
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2021-09-29 17:35:27 -07:00
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type siginfo struct {
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siginfoFields
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// Pad struct to the max size in the kernel.
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_ [_si_max_size - unsafe.Sizeof(siginfoFields{})]byte
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}
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2021-08-13 08:34:25 -07:00
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type itimerspec struct {
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it_interval timespec
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it_value timespec
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}
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2014-11-18 11:38:23 -05:00
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type itimerval struct {
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it_interval timeval
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it_value timeval
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}
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2021-09-29 17:35:27 -07:00
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type sigeventFields struct {
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2021-08-13 08:34:25 -07:00
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value uintptr
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signo int32
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notify int32
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// below here is a union; sigev_notify_thread_id is the only field we use
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sigev_notify_thread_id int32
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}
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2021-09-29 17:35:27 -07:00
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type sigevent struct {
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sigeventFields
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// Pad struct to the max size in the kernel.
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_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
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}
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2014-11-18 11:38:23 -05:00
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// created by cgo -cdefs and then converted to Go
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// cgo -cdefs defs_linux.go defs3_linux.go
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const (
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_O_RDONLY = 0x0
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2019-04-03 16:31:13 -07:00
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_O_NONBLOCK = 0x800
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2014-11-18 11:38:23 -05:00
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_O_CLOEXEC = 0x80000
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_SA_RESTORER = 0
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)
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type ptregs struct {
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gpr [32]uint64
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nip uint64
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msr uint64
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orig_gpr3 uint64
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ctr uint64
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link uint64
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xer uint64
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ccr uint64
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softe uint64
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trap uint64
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dar uint64
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dsisr uint64
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result uint64
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}
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type vreg struct {
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u [4]uint32
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}
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2016-09-25 13:38:54 -07:00
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type stackt struct {
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2014-11-18 11:38:23 -05:00
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ss_sp *byte
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ss_flags int32
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pad_cgo_0 [4]byte
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2014-11-18 15:19:48 -05:00
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ss_size uintptr
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2014-11-18 11:38:23 -05:00
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}
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type sigcontext struct {
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_unused [4]uint64
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signal int32
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_pad0 int32
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handler uint64
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oldmask uint64
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regs *ptregs
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gp_regs [48]uint64
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fp_regs [33]float64
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v_regs *vreg
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vmx_reserve [101]int64
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}
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type ucontext struct {
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uc_flags uint64
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uc_link *ucontext
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2016-09-25 13:38:54 -07:00
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uc_stack stackt
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2014-11-18 11:38:23 -05:00
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uc_sigmask uint64
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__unused [15]uint64
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uc_mcontext sigcontext
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}
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