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qemu/io/trace-events
Daniel P. Berrangé dbb44504c2 io: add qio_task_wait_thread to join with a background thread 
Add the ability for a caller to wait for completion of the
background thread to synchronously dispatch its result, without
needing to wait for the main loop to run the idle callback.

This method needs very careful usage to avoid a dangerous
race condition with the free'ing of the task. The completion
callback is normally invoked from an idle callback registered
with the main loop context. The qio_task_wait_thread method
must only be called if the completion callback has not yet
run. The only safe way to achieve this is to run the
qio_task_wait_thread method from the thread that executes
the main loop.

It is generally a bad idea to use this method since it will
block execution of the main loop, however, the design of
the character devices and its usage from vhostuser already
requires blocking execution.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20190211182442.8542-3-berrange@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2019-02-12 17:35:56 +01:00

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# See docs/devel/tracing.txt for syntax documentation.
# io/task.c
qio_task_new(void *task, void *source, void *func, void *opaque) "Task new task=%p source=%p func=%p opaque=%p"
qio_task_complete(void *task) "Task complete task=%p"
qio_task_thread_start(void *task, void *worker, void *opaque) "Task thread start task=%p worker=%p opaque=%p"
qio_task_thread_run(void *task) "Task thread run task=%p"
qio_task_thread_exit(void *task) "Task thread exit task=%p"
qio_task_thread_result(void *task) "Task thread result task=%p"
qio_task_thread_source_attach(void *task, void *source) "Task thread source attach task=%p source=%p"
qio_task_thread_source_cancel(void *task, void *source) "Task thread source cancel task=%p source=%p"
# io/channel-socket.c
qio_channel_socket_new(void *ioc) "Socket new ioc=%p"
qio_channel_socket_new_fd(void *ioc, int fd) "Socket new ioc=%p fd=%d"
qio_channel_socket_connect_sync(void *ioc, void *addr) "Socket connect sync ioc=%p addr=%p"
qio_channel_socket_connect_async(void *ioc, void *addr) "Socket connect async ioc=%p addr=%p"
qio_channel_socket_connect_fail(void *ioc) "Socket connect fail ioc=%p"
qio_channel_socket_connect_complete(void *ioc, int fd) "Socket connect complete ioc=%p fd=%d"
qio_channel_socket_listen_sync(void *ioc, void *addr) "Socket listen sync ioc=%p addr=%p"
qio_channel_socket_listen_async(void *ioc, void *addr) "Socket listen async ioc=%p addr=%p"
qio_channel_socket_listen_fail(void *ioc) "Socket listen fail ioc=%p"
qio_channel_socket_listen_complete(void *ioc, int fd) "Socket listen complete ioc=%p fd=%d"
qio_channel_socket_dgram_sync(void *ioc, void *localAddr, void *remoteAddr) "Socket dgram sync ioc=%p localAddr=%p remoteAddr=%p"
qio_channel_socket_dgram_async(void *ioc, void *localAddr, void *remoteAddr) "Socket dgram async ioc=%p localAddr=%p remoteAddr=%p"
qio_channel_socket_dgram_fail(void *ioc) "Socket dgram fail ioc=%p"
qio_channel_socket_dgram_complete(void *ioc, int fd) "Socket dgram complete ioc=%p fd=%d"
qio_channel_socket_accept(void *ioc) "Socket accept start ioc=%p"
qio_channel_socket_accept_fail(void *ioc) "Socket accept fail ioc=%p"
qio_channel_socket_accept_complete(void *ioc, void *cioc, int fd) "Socket accept complete ioc=%p cioc=%p fd=%d"
# io/channel-file.c
qio_channel_file_new_fd(void *ioc, int fd) "File new fd ioc=%p fd=%d"
qio_channel_file_new_path(void *ioc, const char *path, int flags, int mode, int fd) "File new fd ioc=%p path=%s flags=%d mode=%d fd=%d"
# io/channel-tls.c
qio_channel_tls_new_client(void *ioc, void *master, void *creds, const char *hostname) "TLS new client ioc=%p master=%p creds=%p hostname=%s"
qio_channel_tls_new_server(void *ioc, void *master, void *creds, const char *aclname) "TLS new client ioc=%p master=%p creds=%p acltname=%s"
qio_channel_tls_handshake_start(void *ioc) "TLS handshake start ioc=%p"
qio_channel_tls_handshake_pending(void *ioc, int status) "TLS handshake pending ioc=%p status=%d"
qio_channel_tls_handshake_fail(void *ioc) "TLS handshake fail ioc=%p"
qio_channel_tls_handshake_complete(void *ioc) "TLS handshake complete ioc=%p"
qio_channel_tls_credentials_allow(void *ioc) "TLS credentials allow ioc=%p"
qio_channel_tls_credentials_deny(void *ioc) "TLS credentials deny ioc=%p"
# io/channel-websock.c
qio_channel_websock_new_server(void *ioc, void *master) "Websock new client ioc=%p master=%p"
qio_channel_websock_handshake_start(void *ioc) "Websock handshake start ioc=%p"
qio_channel_websock_handshake_pending(void *ioc, int status) "Websock handshake pending ioc=%p status=%d"
qio_channel_websock_handshake_reply(void *ioc) "Websock handshake reply ioc=%p"
qio_channel_websock_handshake_fail(void *ioc, const char *msg) "Websock handshake fail ioc=%p err=%s"
qio_channel_websock_handshake_complete(void *ioc) "Websock handshake complete ioc=%p"
qio_channel_websock_http_greeting(void *ioc, const char *greeting) "Websocket HTTP request ioc=%p greeting='%s'"
qio_channel_websock_http_request(void *ioc, const char *protocols, const char *version, const char *host, const char *connection, const char *upgrade, const char *key) "Websocket HTTP request ioc=%p protocols='%s' version='%s' host='%s' connection='%s' upgrade='%s' key='%s'"
qio_channel_websock_header_partial_decode(void *ioc, size_t payloadlen, unsigned char fin, unsigned char opcode, unsigned char has_mask) "Websocket header decoded ioc=%p payload-len=%zu fin=0x%x opcode=0x%x has_mask=0x%x"
qio_channel_websock_header_full_decode(void *ioc, size_t headerlen, size_t payloadlen, uint32_t mask) "Websocket header decoded ioc=%p header-len=%zu payload-len=%zu mask=0x%x"
qio_channel_websock_payload_decode(void *ioc, uint8_t opcode, size_t payload_remain) "Websocket header decoded ioc=%p opcode=0x%x payload-remain=%zu"
qio_channel_websock_encode(void *ioc, uint8_t opcode, size_t payloadlen, size_t headerlen) "Websocket encoded ioc=%p opcode=0x%x header-len=%zu payload-len=%zu"
qio_channel_websock_close(void *ioc) "Websocket close ioc=%p"
# io/channel-command.c
qio_channel_command_new_pid(void *ioc, int writefd, int readfd, int pid) "Command new pid ioc=%p writefd=%d readfd=%d pid=%d"
qio_channel_command_new_spawn(void *ioc, const char *binary, int flags) "Command new spawn ioc=%p binary=%s flags=%d"
qio_channel_command_abort(void *ioc, int pid) "Command abort ioc=%p pid=%d"
qio_channel_command_wait(void *ioc, int pid, int ret, int status) "Command abort ioc=%p pid=%d ret=%d status=%d"
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