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ntdll: Process system APCs while the signals are blocked. 

This makes sure that system APC, such as APC_BREAK_PROCESS do not get
interrupted in the middle of their execution, and that the APC
completion notification is always correctly sent back to the caller.

Otherwise DbgBreakProcess sometimes did not return until
WaitForDebugEvent/ContinueDebugEvent are called, because of a race
condition between the APC servicing thread, and the newly created
exception thread.

Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Rémi Bernon 2020-02-05 11:49:40 +01:00 committed by Alexandre Julliard
parent 2dc99bfb30
commit 544fd9504a
2 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
dlls/ntdll/server.c
View File

@ -601,11 +601,13 @@ unsigned int server_select( const select_op_t *select_op, data_size_t size, UINT
apc_call_t call;
apc_result_t result;
timeout_t abs_timeout = timeout ? timeout->QuadPart : TIMEOUT_INFINITE;
sigset_t old_set;
memset( &result, 0, sizeof(result) );
do
{
pthread_sigmask( SIG_BLOCK, &server_block_set, &old_set );
for (;;)
{
SERVER_START_REQ( select )
@ -616,7 +618,7 @@ unsigned int server_select( const select_op_t *select_op, data_size_t size, UINT
req->timeout = abs_timeout;
wine_server_add_data( req, &result, sizeof(result) );
wine_server_add_data( req, select_op, size );
ret = wine_server_call( req );
ret = server_call_unlocked( req );
abs_timeout = reply->timeout;
apc_handle = reply->apc_handle;
call = reply->call;
@ -630,6 +632,7 @@ unsigned int server_select( const select_op_t *select_op, data_size_t size, UINT
if (ret != STATUS_KERNEL_APC) break;
invoke_apc( &call, &result );
}
pthread_sigmask( SIG_SETMASK, &old_set, NULL );
if (ret == STATUS_USER_APC)
{

5
dlls/ntdll/sync.c
View File

@ -2457,6 +2457,7 @@ NTSTATUS WINAPI RtlWaitOnAddress( const void *addr, const void *cmp, SIZE_T size
apc_call_t call;
apc_result_t result;
timeout_t abs_timeout = timeout ? timeout->QuadPart : TIMEOUT_INFINITE;
sigset_t old_set;
if (size != 1 && size != 2 && size != 4 && size != 8)
return STATUS_INVALID_PARAMETER;
@ -2479,6 +2480,7 @@ NTSTATUS WINAPI RtlWaitOnAddress( const void *addr, const void *cmp, SIZE_T size
return STATUS_SUCCESS;
}
pthread_sigmask( SIG_BLOCK, &server_block_set, &old_set );
for (;;)
{
SERVER_START_REQ( select )
@ -2489,7 +2491,7 @@ NTSTATUS WINAPI RtlWaitOnAddress( const void *addr, const void *cmp, SIZE_T size
req->timeout = abs_timeout;
wine_server_add_data( req, &result, sizeof(result) );
wine_server_add_data( req, &select_op, sizeof(select_op.keyed_event) );
ret = wine_server_call( req );
ret = server_call_unlocked( req );
abs_timeout = reply->timeout;
apc_handle = reply->apc_handle;
call = reply->call;
@ -2499,6 +2501,7 @@ NTSTATUS WINAPI RtlWaitOnAddress( const void *addr, const void *cmp, SIZE_T size
if (ret != STATUS_KERNEL_APC) break;
invoke_apc( &call, &result );
}
pthread_sigmask( SIG_SETMASK, &old_set, NULL );
RtlLeaveCriticalSection( &addr_section );