Zebediah Figura : server: Explicitly return whether a select request was immediately signaled.
Module: wine Branch: master Commit: bedd92ca068434eea7cb6b445a3fcf21b51acbaf URL: https://source.winehq.org/git/wine.git/?a=commit;h=bedd92ca068434eea7cb6b445... Author: Zebediah Figura <zfigura(a)codeweavers.com> Date: Mon Jul 5 11:20:01 2021 -0500 server: Explicitly return whether a select request was immediately signaled. This fixes a regression introduced by 97afac469fbe012e22acc1f1045c88b1004a241f. If we make a request on an asynchronous device handle, and the IRP handler returns STATUS_PENDING, wait_async() will return STATUS_PENDING, as intended. However, if the async object is signaled before the user has a chance to call wait_async() [e.g. if get_next_device_request is called quickly enough], select will return STATUS_PENDING immediately, which causes server_select() to think the object is not signaled, and wait for a select reply forever. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51277 Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51295 Signed-off-by: Zebediah Figura <zfigura(a)codeweavers.com> Signed-off-by: Alexandre Julliard <julliard(a)winehq.org> --- dlls/ntdll/unix/server.c | 4 +++- include/wine/server_protocol.h | 4 ++-- server/protocol.def | 1 + server/request.h | 1 + server/thread.c | 32 ++++++++++++++++---------------- server/trace.c | 1 + 6 files changed, 24 insertions(+), 19 deletions(-) diff --git a/dlls/ntdll/unix/server.c b/dlls/ntdll/unix/server.c index 567f50d0ad7..1d82e806e17 100644 --- a/dlls/ntdll/unix/server.c +++ b/dlls/ntdll/unix/server.c @@ -603,6 +603,7 @@ unsigned int server_select( const select_op_t *select_op, data_size_t size, UINT apc_call_t call; apc_result_t result; sigset_t old_set; + int signaled; memset( &result, 0, sizeof(result) ); @@ -628,6 +629,7 @@ unsigned int server_select( const select_op_t *select_op, data_size_t size, UINT } if (context) wine_server_set_reply( req, context, 2 * sizeof(*context) ); ret = server_call_unlocked( req ); + signaled = reply->signaled; apc_handle = reply->apc_handle; call = reply->call; } @@ -646,7 +648,7 @@ unsigned int server_select( const select_op_t *select_op, data_size_t size, UINT mutex_unlock( mutex ); mutex = NULL; } - if (ret != STATUS_PENDING) break; + if (signaled) break; ret = wait_select_reply( &cookie ); } diff --git a/include/wine/server_protocol.h b/include/wine/server_protocol.h index 867f99a7627..4611f38c5c4 100644 --- a/include/wine/server_protocol.h +++ b/include/wine/server_protocol.h @@ -1313,8 +1313,8 @@ struct select_reply struct reply_header __header; apc_call_t call; obj_handle_t apc_handle; + int signaled; /* VARARG(contexts,contexts); */ - char __pad_60[4]; }; #define SELECT_ALERTABLE 1 #define SELECT_INTERRUPTIBLE 2 @@ -6252,7 +6252,7 @@ union generic_reply /* ### protocol_version begin ### */ -#define SERVER_PROTOCOL_VERSION 724 +#define SERVER_PROTOCOL_VERSION 725 /* ### protocol_version end ### */ diff --git a/server/protocol.def b/server/protocol.def index 10402ca2db3..b4049eb90e7 100644 --- a/server/protocol.def +++ b/server/protocol.def @@ -1160,6 +1160,7 @@ typedef struct @REPLY apc_call_t call; /* APC call arguments */ obj_handle_t apc_handle; /* handle to next APC */ + int signaled; /* were the handles immediately signaled? */ VARARG(contexts,contexts); /* suspend context(s) */ @END #define SELECT_ALERTABLE 1 diff --git a/server/request.h b/server/request.h index a5490fd215a..18a6a2df3c7 100644 --- a/server/request.h +++ b/server/request.h @@ -896,6 +896,7 @@ C_ASSERT( FIELD_OFFSET(struct select_request, prev_apc) == 36 ); C_ASSERT( sizeof(struct select_request) == 40 ); C_ASSERT( FIELD_OFFSET(struct select_reply, call) == 8 ); C_ASSERT( FIELD_OFFSET(struct select_reply, apc_handle) == 56 ); +C_ASSERT( FIELD_OFFSET(struct select_reply, signaled) == 60 ); C_ASSERT( sizeof(struct select_reply) == 64 ); C_ASSERT( FIELD_OFFSET(struct create_event_request, access) == 12 ); C_ASSERT( FIELD_OFFSET(struct create_event_request, manual_reset) == 16 ); diff --git a/server/thread.c b/server/thread.c index e0c520ee37c..e23412c6033 100644 --- a/server/thread.c +++ b/server/thread.c @@ -974,8 +974,8 @@ static int signal_object( obj_handle_t handle ) } /* select on a list of handles */ -static void select_on( const select_op_t *select_op, data_size_t op_size, client_ptr_t cookie, - int flags, abstime_t when ) +static int select_on( const select_op_t *select_op, data_size_t op_size, client_ptr_t cookie, + int flags, abstime_t when ) { int ret; unsigned int count; @@ -984,7 +984,7 @@ static void select_on( const select_op_t *select_op, data_size_t op_size, client switch (select_op->op) { case SELECT_NONE: - if (!wait_on( select_op, 0, NULL, flags, when )) return; + if (!wait_on( select_op, 0, NULL, flags, when )) return 1; break; case SELECT_WAIT: @@ -993,24 +993,24 @@ static void select_on( const select_op_t *select_op, data_size_t op_size, client if (op_size < offsetof( select_op_t, wait.handles ) || count > MAXIMUM_WAIT_OBJECTS) { set_error( STATUS_INVALID_PARAMETER ); - return; + return 1; } if (!wait_on_handles( select_op, count, select_op->wait.handles, flags, when )) - return; + return 1; break; case SELECT_SIGNAL_AND_WAIT: if (!wait_on_handles( select_op, 1, &select_op->signal_and_wait.wait, flags, when )) - return; + return 1; if (select_op->signal_and_wait.signal) { if (!signal_object( select_op->signal_and_wait.signal )) { end_wait( current, get_error() ); - return; + return 1; } /* check if we woke ourselves up */ - if (!current->wait) return; + if (!current->wait) return 1; } break; @@ -1018,23 +1018,23 @@ static void select_on( const select_op_t *select_op, data_size_t op_size, client case SELECT_KEYED_EVENT_RELEASE: object = (struct object *)get_keyed_event_obj( current->process, select_op->keyed_event.handle, select_op->op == SELECT_KEYED_EVENT_WAIT ? KEYEDEVENT_WAIT : KEYEDEVENT_WAKE ); - if (!object) return; + if (!object) return 1; ret = wait_on( select_op, 1, &object, flags, when ); release_object( object ); - if (!ret) return; + if (!ret) return 1; current->wait->key = select_op->keyed_event.key; break; default: set_error( STATUS_INVALID_PARAMETER ); - return; + return 1; } if ((ret = check_wait( current )) != -1) { /* condition is already satisfied */ set_error( end_wait( current, ret )); - return; + return 1; } /* now we need to wait */ @@ -1044,12 +1044,12 @@ static void select_on( const select_op_t *select_op, data_size_t op_size, client thread_timeout, current->wait ))) { end_wait( current, get_error() ); - return; + return 1; } } current->wait->cookie = cookie; set_error( STATUS_PENDING ); - return; + return 0; } /* attempt to wake threads sleeping on the object wait queue */ @@ -1664,7 +1664,7 @@ DECL_HANDLER(select) release_object( apc ); } - select_on( &select_op, op_size, req->cookie, req->flags, req->timeout ); + reply->signaled = select_on( &select_op, op_size, req->cookie, req->flags, req->timeout ); if (get_error() == STATUS_USER_APC) { @@ -1684,7 +1684,7 @@ DECL_HANDLER(select) } release_object( apc ); } - else if (get_error() != STATUS_PENDING && get_reply_max_size() >= sizeof(context_t) && + else if (reply->signaled && get_reply_max_size() >= sizeof(context_t) && current->context && current->suspend_cookie == req->cookie) { ctx = current->context; diff --git a/server/trace.c b/server/trace.c index c65694ad644..447710e8f80 100644 --- a/server/trace.c +++ b/server/trace.c @@ -1803,6 +1803,7 @@ static void dump_select_reply( const struct select_reply *req ) { dump_apc_call( " call=", &req->call ); fprintf( stderr, ", apc_handle=%04x", req->apc_handle ); + fprintf( stderr, ", signaled=%d", req->signaled ); dump_varargs_contexts( ", contexts=", cur_size ); }
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Alexandre Julliard