llvm dev - Sep 2004 - [LLVMdev] SlowOperationInformer.cpp:55: error:`SIGALRM' undeclared (first use this functi

>From: Reid Spencer <reid at x10sys.com>
>Date: Fri, 24 Sep 2004 13:03:44 -0700
>
>I just discovered that the *only* place this is used is in the debugger 
>when it is loading files, etc. There should be a way to do this without an 
>alarm. In fact, a thread could easily set the "ShouldShowStatus"
every
>second until the the thing is cancelled. Since the caller is required to 
>update the progress, this could also be done with time deltas without the 
>use of threads or signals. When I get the lib/System/TimeValue abstraction 
>implemented, I'll probably just update SlowOperationInformer to use 
>timestamp deltas rather than signals and avoid this whole problem 
>altogether.
Okay, I'll comment the lines in question for now and see if other gotchas 
will show up.
>Jeff Cohen wrote:
>
>>There's simply no equivalent to signals on Windows.  There is no way
to
>>asynchronously interrupt a thread's processing to execute some
handler.
>>The only thing you can asynchronously do to a thread is kill it, and
>>that's generally frowned upon (who knows what critical sections it
might
>>be holding, etc...).
>>
>>Stuff like alarms is supposed to be done using the
"event-driven" style
>>of programming, using the Windows message queue, APCs or I/O completion
>>ports.  You can do what Reid suggests below, but it begs the question of
>>how one "rings the alarm" in the main thread.  Set a flag
that's
>>periodically checked?  Hmm...  guess that's what this particular
signal
>>handler does anyway :)  Actually, one can dispense with the extra thread
>>by using waitable timers and periodically checking its state, so long as
>>you don't plan on supporting Win95 or NT 3.1/3.5.
>>
>>It definitely belongs in lib/System.
>>
>>On Fri, 24 Sep 2004 12:00:10 -0700
>>Reid Spencer <reid at x10sys.com> wrote:
>>
>>
>>>Ultimately, this is another function that needs to go into
lib/System. An
>>>alternate approach is to fork a thread, sleep, and when the thread
wakes
>>>up, "ring the alarm".
>>>
>>>Reid.
>>>
>>>John Criswell wrote:
>>>
>>>>Henrik Bach wrote:
>>>>
>>>>
>>>>>Hi
>>>>>
>>>>>I'm compiling: 
>>>>>/usr/local/src/llvm/lib/Support/SlowOperationInformer.cpp on
MinGW.
>>>>>However, it stops complaining about that SIGALRM is
undeclared:
>>>>
>>>>
>>>>Is there an alarm() syscall on MinGW?  And if so, what signal
does it
>>>>send (according to the MinGW docs)?
>>>>
>>>>-- John T.
>>>>
>>>>
>>>>>--------------------------
>>>>>@ /usr/local/build/llvm/mklib --tag=disable-shared --silent
--tag=CXX
>>>>>--mode=compile g++ -c -I/usr/local/build/llvm/lib/Support 
>>>>>-I/usr/local/src/llvm/lib/Support
-I/usr/local/build/llvm/include
>>>>>-I/usr/local/src/llvm/include -I../../include 
>>>>>-I/usr/local/src/llvm/include -D__MINGW -D_GNU_SOURCE 
>>>>>-D__STDC_LIMIT_MACROS -Wall -W -Wwrite-strings -Wno-unused
-g -D_DEBUG
>>>>>/usr/local/src/llvm/lib/Support/SlowOperationInformer.cpp -o
>>>>>/usr/local/build/llvm/lib/Support/Debug/SlowOperationInformer.lo
>>>>>C:/MinGW/msys/local/src/llvm/lib/Support/SlowOperationInformer.cpp:
In
>>>>>  constructor
`llvm::SlowOperationInformer::SlowOperationInformer(const
>>>>>  std::string&)':
>>>>>C:/MinGW/msys/local/src/llvm/lib/Support/SlowOperationInformer.cpp:55:
>>>>>error: `
>>>>>  SIGALRM' undeclared (first use this function)
>>>>>--------------------------
>>>>>
>>>>>On mingw the signal value SIGALRM isn't declared in
<signal.h>.
>>>>>
>>>>>I can't figure out what to do next. Any suggestions?
>>>>>
>>>>>Henrik
>>>>>
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>>>>
>>>>
>>>>
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>>
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>
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