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path: root/src/pkg/runtime/thread_linux.c
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2013-03-14runtime: refactor os-specific codeRuss Cox
thread_GOOS.c becomes os_GOOS.c. signal_GOOS_GOARCH.c becomes os_GOOS_GOARCH.c, but with non-GOARCH-specific code moved into os_GOOS.c. The actual arch-specific signal handler moves into signal_GOARCH.c to avoid per-GOOS duplication. New files signal_GOOS_GOARCH.h provide macros for accessing fields of the very system-specific signal info structs. Lots moving, but nothing changing. This is a preliminarly cleanup so I can work on the signal handling code to fix some open issues without having to make each change 13 times. Tested on Linux and OS X, 386 and amd64. Will fix Plan 9, Windows, and ARM after the fact if necessary. (Plan 9 and Windows should be fine; ARM will probably have some typos.) Net effect: -1081 lines of code. R=golang-dev, r CC=golang-dev https://golang.org/cl/7565048
2013-03-14runtime: integrated network poller for linuxDmitriy Vyukov
vs tip: BenchmarkTCP4OneShot 172994 40485 -76.60% BenchmarkTCP4OneShot-2 96581 30028 -68.91% BenchmarkTCP4OneShot-4 52615 18454 -64.93% BenchmarkTCP4OneShot-8 26351 12289 -53.36% BenchmarkTCP4OneShot-16 12258 16093 +31.29% BenchmarkTCP4OneShot-32 13200 17045 +29.13% BenchmarkTCP4OneShotTimeout 124814 42932 -65.60% BenchmarkTCP4OneShotTimeout-2 99090 29040 -70.69% BenchmarkTCP4OneShotTimeout-4 51860 18455 -64.41% BenchmarkTCP4OneShotTimeout-8 26100 12073 -53.74% BenchmarkTCP4OneShotTimeout-16 12198 16654 +36.53% BenchmarkTCP4OneShotTimeout-32 13438 17143 +27.57% BenchmarkTCP4Persistent 115647 7782 -93.27% BenchmarkTCP4Persistent-2 58024 4808 -91.71% BenchmarkTCP4Persistent-4 24715 3674 -85.13% BenchmarkTCP4Persistent-8 16431 2407 -85.35% BenchmarkTCP4Persistent-16 2336 1875 -19.73% BenchmarkTCP4Persistent-32 1689 1637 -3.08% BenchmarkTCP4PersistentTimeout 79754 7859 -90.15% BenchmarkTCP4PersistentTimeout-2 57708 5952 -89.69% BenchmarkTCP4PersistentTimeout-4 26907 3823 -85.79% BenchmarkTCP4PersistentTimeout-8 15036 2567 -82.93% BenchmarkTCP4PersistentTimeout-16 2507 1903 -24.09% BenchmarkTCP4PersistentTimeout-32 1717 1627 -5.24% vs old scheduler: benchmark old ns/op new ns/op delta BenchmarkTCPOneShot 192244 40485 -78.94% BenchmarkTCPOneShot-2 63835 30028 -52.96% BenchmarkTCPOneShot-4 35443 18454 -47.93% BenchmarkTCPOneShot-8 22140 12289 -44.49% BenchmarkTCPOneShot-16 16930 16093 -4.94% BenchmarkTCPOneShot-32 16719 17045 +1.95% BenchmarkTCPOneShotTimeout 190495 42932 -77.46% BenchmarkTCPOneShotTimeout-2 64828 29040 -55.20% BenchmarkTCPOneShotTimeout-4 34591 18455 -46.65% BenchmarkTCPOneShotTimeout-8 21989 12073 -45.10% BenchmarkTCPOneShotTimeout-16 16848 16654 -1.15% BenchmarkTCPOneShotTimeout-32 16796 17143 +2.07% BenchmarkTCPPersistent 81670 7782 -90.47% BenchmarkTCPPersistent-2 26598 4808 -81.92% BenchmarkTCPPersistent-4 15633 3674 -76.50% BenchmarkTCPPersistent-8 18093 2407 -86.70% BenchmarkTCPPersistent-16 17472 1875 -89.27% BenchmarkTCPPersistent-32 7679 1637 -78.68% BenchmarkTCPPersistentTimeout 83186 7859 -90.55% BenchmarkTCPPersistentTimeout-2 26883 5952 -77.86% BenchmarkTCPPersistentTimeout-4 15776 3823 -75.77% BenchmarkTCPPersistentTimeout-8 18180 2567 -85.88% BenchmarkTCPPersistentTimeout-16 17454 1903 -89.10% BenchmarkTCPPersistentTimeout-32 7798 1627 -79.14% R=golang-dev, iant, bradfitz, dave, rsc CC=golang-dev https://golang.org/cl/7579044
2013-03-12runtime: faster & safer hash functionKeith Randall
Uses AES hardware instructions on 386/amd64 to implement a fast hash function. Incorporates a random key to thwart hash collision DOS attacks. Depends on CL#7548043 for new assembly instructions. Update #3885 Helps some by making hashing faster. Go time drops from 0.65s to 0.51s. R=rsc, r, bradfitz, remyoudompheng, khr, dsymonds, minux.ma, elias.naur CC=golang-dev https://golang.org/cl/7543043
2013-03-01runtime: start all threads with runtime.mstartRuss Cox
Putting the M initialization in multiple places will not scale. Various code assumes mstart is the start already. Make it so. R=golang-dev, devon.odell CC=golang-dev https://golang.org/cl/7420048
2013-03-01runtime: fix new scheduler on freebsd, windowsRuss Cox
R=devon.odell CC=golang-dev https://golang.org/cl/7443046
2013-02-21runtime: split minit() to mpreinit() and minit()Dmitriy Vyukov
mpreinit() is called on the parent thread and with mcache (can allocate memory), minit() is called on the child thread and can not allocate memory. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/7389043
2013-02-20runtime: allow cgo callbacks on non-Go threadsRuss Cox
Fixes #4435. R=golang-dev, iant, alex.brainman, minux.ma, dvyukov CC=golang-dev https://golang.org/cl/7304104
2013-02-18runtime: preparation for non-Go threads running Go codeRuss Cox
* Handle p==nil in signalstack by setting SS_DISABLE flag. * Make minit only allocate a signal g if there's not one already. R=golang-dev, r CC=golang-dev https://golang.org/cl/7323072
2013-02-15runtime: fix build on linuxRuss Cox
In addition to the compile failure fixed in signal*.c, preserving the signal mask led to very strange crashes. Testing shows that looking for SIG_IGN is all that matters to get along with nohup, so reintroduce sigset_zero instead of trying to preserve the signal mask. TBR=iant CC=golang-dev https://golang.org/cl/7323067
2013-02-15runtime: fix running under nohupRuss Cox
There are two ways nohup(1) might be implemented: it might mask away the signal, or it might set the handler to SIG_IGN, both of which are inherited across fork+exec. So two fixes: * Make sure to preserve the inherited signal mask at minit instead of clearing it. * If the SIGHUP handler is SIG_IGN, leave it that way. Fixes #4491. R=golang-dev, mikioh.mikioh, iant CC=golang-dev https://golang.org/cl/7308102
2013-02-14runtime: expand error for signal received on non-Go thread.Alan Donovan
We call runtime.findnull dynamically to avoid exceeding the static nosplit stack limit check. (Thanks minux!) Fixes #4048. R=rsc, minux.ma, ality CC=golang-dev https://golang.org/cl/7232066
2012-12-19runtime: use "mp" and "gp" instead of "m" and "g" for local variable name to ā†µJingcheng Zhang
avoid confusion with the global "m" and "g". R=golang-dev, minux.ma, rsc CC=bradfitz, golang-dev https://golang.org/cl/6939064
2012-09-04runtime: discard SIGPROF delivered to non-Go threads.Alan Donovan
Signal handlers are global resources but many language environments (Go, C++ at Google, etc) assume they have sole ownership of a particular handler. Signal handlers in mixed-language applications must therefore be robust against unexpected delivery of certain signals, such as SIGPROF. The default Go signal handler runtimeĀ·sigtramp assumes that it will never be called on a non-Go thread, but this assumption is violated by when linking in C++ code that spawns threads. Specifically, the handler asserts the thread has an associated "m" (Go scheduler). This CL is a very simple workaround: discard SIGPROF delivered to non-Go threads. runtime.badsignal(int32) now receives the signal number; if it returns without panicking (e.g. sig==SIGPROF) the signal is discarded. I don't think there is any really satisfactory solution to the problem of signal-based profiling in a mixed-language application. It's not only the issue of handler clobbering, but also that a C++ SIGPROF handler called in a Go thread can't unwind the Go stack (and vice versa). The best we can hope for is not crashing. Note: - I've ported this to all POSIX platforms, except ARM-linux which already ignores unexpected signals on m-less threads. - I've avoided tail-calling runtime.badsignal because AFAICT the 6a/6l don't support it. - I've avoided hoisting 'push sig' (common to both function calls) because it makes the code harder to read. - Fixed an (apparently incorrect?) docstring. R=iant, rsc, minux.ma CC=golang-dev https://golang.org/cl/6498057
2012-08-10runtime: use sched_getaffinity for runtime.NumCPU() on LinuxShenghou Ma
Fixes #3921. R=iant CC=golang-dev https://golang.org/cl/6448132
2012-05-30runtime: update field types in preparation for GC changesJan Ziak
R=rsc, remyoudompheng, minux.ma, ality CC=golang-dev https://golang.org/cl/6242061
2012-03-12runtime: print error on receipt of signal on non-Go threadRuss Cox
It's the best we can do before Go 1. For issue 3250; not a fix but at least less mysterious. R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/5797068
2012-03-08cgo, runtime: diagnose callback on non-Go threadRuss Cox
Before: $ go run x.go signal 11 (core dumped) $ After: $ go run x.go runtime: cgo callback on thread not created by Go. signal 11 (core dumped) $ For issue 3068. Not a fix, but as much of a fix as we can do before Go 1. R=golang-dev, rogpeppe, gri CC=golang-dev https://golang.org/cl/5781047
2012-02-28runtime/pprof: support OS X CPU profilingRuss Cox
Work around profiling kernel bug with signal masks. Still broken on 64-bit Snow Leopard kernel, but I think we can ignore that one and let people upgrade to Lion. Add new trivial tools addr2line and objdump to take the place of the GNU tools of the same name, since those are not installed on OS X. Adapt pprof to invoke 'go tool addr2line' and 'go tool objdump' if the system tools do not exist. Clean up disassembly of base register on amd64. Fixes #2008. R=golang-dev, bradfitz, mikioh.mikioh, r, iant CC=golang-dev https://golang.org/cl/5697066
2012-02-24runtime: size arena to fit in virtual address space limitRuss Cox
For Brad. Now FreeBSD/386 binaries run on nearlyfreespeech.net. Fixes #2302. R=golang-dev, r CC=golang-dev https://golang.org/cl/5700060
2012-02-23runtime: linux signal maskingRuss Cox
Fixes #3101 (Linux). R=golang-dev, bradfitz, minux.ma CC=golang-dev https://golang.org/cl/5696043
2012-01-10runtime: distinct panic message for call of nil func valueRuss Cox
R=golang-dev, gri CC=golang-dev https://golang.org/cl/5531062
2011-12-16runtime: make more build-friendlyRuss Cox
Collapse the arch,os-specific directories into the main directory by renaming xxx/foo.c to foo_xxx.c, and so on. There are no substantial edits here, except to the Makefile. The assumption is that the Go tool will #define GOOS_darwin and GOARCH_amd64 and will make any file named something like signals_darwin.h available as signals_GOOS.h during the build. This replaces what used to be done with -I$(GOOS). There is still work to be done to make runtime build with standard tools, but this is a big step. After this we will have to write a script to generate all the generated files so they can be checked in (instead of generated during the build). R=r, iant, r, lucio.dere CC=golang-dev https://golang.org/cl/5490053
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