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2012-08-21eventfd: making it thread safeAlexey Kardashevskiy
QEMU uses IO handlers to run select() in the main loop. The handlers list is managed by qemu_set_fd_handler() helper which works fine when called from the main thread as it is called when select() is not waiting. However IO handlers list can be changed in the thread other than the main one doing os_host_main_loop_wait(), for example, as a result of a hypercall which changes PCI config space (VFIO on POWER is the case) and enables/disabled MSI/MSIX which closes/creates eventfd handles. As the main loop should be waiting on the newly created eventfds, it has to be restarted. The patch adds the qemu_notify_event() call to interrupt select() to make main_loop() restart select() with the updated IO handlers list. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-05-01iohandler: Use bool for boolean struct member and remove holesStefan Weil
Using bool reduces the size of the structure and improves readability. Two holes in the structure were removed. Signed-off-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-10-21Revert to a hand-made select loopPaolo Bonzini
This reverts commit c82dc29a9112f34e0a51cad9a412cf6d9d05dfb2 and 4d88a2ac8643265108ef1fb47ceee5d7b28e19f2. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-10-21main-loop: create main-loop.hPaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-09-08iohandlers: fix issue with qemu_set_fd_handler()Anthony Liguori
As spotted by Aneesh, some users pass a NULL opaque so we need to be more aggressive in checking whether a user means to unregister. Also fix a double free caused by tag not being reset to zero after delete. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-09-01main: switch qemu_set_fd_handler to g_io_add_watchAnthony Liguori
This patch changes qemu_set_fd_handler to be implemented in terms of g_io_add_watch(). The semantics are a bit different so some glue is required. qemu_set_fd_handler2 is much harder to convert because of its use of polling. The glib main loop has the major of advantage of having a proven thread safe architecture. By using the glib main loop instead of our own, it will allow us to eventually introduce multiple I/O threads. I'm pretty sure that this will work on Win32, but I would appreciate some help testing. I think the semantics of g_io_channel_unix_new() are really just tied to the notion of a "unix fd" and not necessarily unix itself. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-08-20Use glib memory allocation and free functionsAnthony Liguori
qemu_malloc/qemu_free no longer exist after this commit. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-03-29add a service to reap zombies, use it in SLIRPPaolo Bonzini
SLIRP -smb support wants to fork a process and forget about reaping it. To please it, add a generic service to register a process id and let QEMU reap it. In the future it could be enhanced to pass a status, but this would be unused. With this in place, the SIGCHLD signal handler would not stomp on pclose anymore. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-03-29extract I/O handler lists to iohandler.cPaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>