path: root/coroutine-sigaltstack.c
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2013-02-26Merge remote-tracking branch 'kwolf/for-anthony' into stagingAnthony Liguori
# By Paolo Bonzini (7) and others # Via Kevin Wolf * kwolf/for-anthony: (22 commits) pc: add compatibility machine types for 1.4 blockdev: enable discard by default qemu-nbd: add --discard option blockdev: add discard suboption to -drive block: implement BDRV_O_UNMAP block: complete all IOs before .bdrv_truncate coroutine: trim down nesting level in perf_nesting test coroutine: move pooling to common code qemu-iotests: Test qcow2 image creation options qemu-iotests: Add qemu-img compare test qemu-img: Add compare subcommand qemu-img: Add "Quiet mode" option block: Add synchronous wrapper for bdrv_co_is_allocated_above block: refuse negative iops and bps values block: use Error in do_check_io_limits() qcow2: support compressed clusters in BlockFragInfo qemu-img: add compressed clusters to BlockFragInfo qemu-img: fix missing space in qemu-img check output qcow2: record fragmentation statistics during check qcow2: introduce check_refcounts_l1/l2() flags ...
2013-02-23Replace all setjmp()/longjmp() with sigsetjmp()/siglongjmp()Peter Maydell
The setjmp() function doesn't specify whether signal masks are saved and restored; on Linux they are not, but on BSD (including MacOSX) they are. We want to have consistent behaviour across platforms, so we should always use "don't save/restore signal mask" (this is also generally going to be faster). This also works around a bug in MacOSX where the signal-restoration on longjmp() affects the signal mask for a completely different thread, not just the mask for the thread which did the longjmp. The most visible effect of this was that ctrl-C was ignored on MacOSX because the CPU thread did a longjmp which resulted in its signal mask being applied to every thread, so that all threads had SIGINT and SIGTERM blocked. The POSIX-sanctioned portable way to do a jump without affecting signal masks is to siglongjmp() to a sigjmp_buf which was created by calling sigsetjmp() with a zero savemask parameter, so change all uses of setjmp()/longjmp() accordingly. [Technically POSIX allows sigsetjmp(buf, 0) to save the signal mask; however the following siglongjmp() must not restore the signal mask, so the pair can be effectively considered as "sigjmp/longjmp which don't touch the mask".] For Windows we provide a trivial sigsetjmp/siglongjmp in terms of setjmp/longjmp -- this is OK because no user will ever pass a non-zero savemask. The setjmp() uses in tests/tcg/test-i386.c and tests/tcg/linux-test.c are left untouched because these are self-contained singlethreaded test programs intended to be run under QEMU's Linux emulation, so they have neither the portability nor the multithreading issues to deal with. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Tested-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2013-02-22coroutine: move pooling to common codePaolo Bonzini
The coroutine pool code is duplicated between the ucontext and sigaltstack backends, and absent from the win32 backend. But the code can be shared easily by moving it to qemu-coroutine.c. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-12-19block: move include files to include/block/Paolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-11-30coroutine-sigaltstack.c: Use stack_t, not struct sigaltstackPeter Maydell
Use the POSIX-specified stack_t type as the argument to sigaltstack() rather than the legacy struct sigaltstack. This allows us to compile on MacOSX with --with-coroutine=sigaltstack. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-05-14Merge remote-tracking branch 'kwolf/for-anthony' into stagingAnthony Liguori
* kwolf/for-anthony: qemu-img: Fix segmentation fault qcow2: Don't ignore failure to clear autoclear flags coroutine: Fix setup of sigaltstack coroutines
2012-05-14coroutine: Fix setup of sigaltstack coroutinesJan Kiszka
Use pthread_kill instead of process-wide kill to invoke the signal handler used for stack switching. This may fix spurious lock-ups with this backend, easily triggerable by extending the time window between kill and sigsuspend. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-05-14fix some common typosJim Meyering
These were identified using: http://github.com/lyda/misspell-check and run like this to create a bourne shell script using GNU sed's -i option: git ls-files|grep -vF .bin | misspellings -f - |grep -v '^ERROR:' |perl \ -pe 's/^(.*?)\[(\d+)\]: (\w+) -> "(.*?)"$/sed -i '\''${2}s!$3!$4!'\'' $1/' Manually eliding the FP, "rela->real" and resolving "addres" to address (not "adders") we get this: sed -i '450s!thru!through!' Changelog sed -i '260s!neccessary!necessary!' coroutine-sigaltstack.c sed -i '54s!miniscule!minuscule!' disas.c sed -i '1094s!thru!through!' hw/usb/hcd-ehci.c sed -i '1095s!thru!through!' hw/usb/hcd-ehci.c sed -i '21s!unecessary!unnecessary!' qapi-schema-guest.json sed -i '307s!explictly!explicitly!' qemu-ga.c sed -i '490s!preceeding!preceding!' qga/commands-posix.c sed -i '792s!addres!address!' qga/commands-posix.c sed -i '6s!beeing!being!' tests/tcg/test-mmap.c Also, manually fix "arithmentic", spotted by Peter Maydell: sed -i 's!arithmentic!arithmetic!' coroutine-sigaltstack.c Signed-off-by: Jim Meyering <meyering@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
2012-03-12coroutine: adding sigaltstack method (.c source)Alex Barcelo
This file is based in both coroutine-ucontext.c and pth_mctx.c (from the GNU Portable Threads library). The mechanism used to change stacks is the sigaltstack function (variant 2 of the pth library). v2: Some corrections. Moving global variables into thread storage (CoroutineThreadState). Signed-off-by: Alex Barcelo <abarcelo@ac.upc.edu> Signed-off-by: Kevin Wolf <kwolf@redhat.com>