I would like to change this code
------
#include <fstream>
int main () {
std::fstream fs;
fs.open ("test.txt", std::fstream::in | std::fstream::out |
std::fstream::app);
fs << " more lorem ipsum";
fs.close();
return 0;
}
-------
To look like this
#include <fstream>
int main () {
using my_read = std::fstream::in; //<== Error: expected type-specifier
std::fstream fs;
fs.open ("test.txt", my_read | std::fstream::out; | std::fstream::app);
fs << " more lorem ipsum";
fs.close();
return 0;
}
What am I doing wrong?
-----Original Message-----
From: Markus Trippelsdorf
Sent: Wednesday, June 25, 2014 7:59 AM
To: Vincenzo Innocente
Cc: gcc-help@xxxxxxxxxxx
Subject: Re: is it safe to generate profiles from multiple concurrent
processes?
On 2014.06.25 at 11:35 +0200, Vincenzo Innocente wrote:
I have built a library with -fprofile-generate. Now I want to
generate profiles using various applications that link that library.
My understanding is that it is safe to run a multi-thread process to
populate the profiles.
It is unclear to me if one can safely run multiple processes concurrently.
is there any risk of corruption or overwriting of the various "gcdaâ€
files if different processes attempt to write on them? If safe I can
easily speed up the generation of profiles by orders of magnitude.
The gcda files are accessed by proper locks, so you should be save.
(See gcc/gcov-io.c).
--
Markus
