Build 32-bits RPM under 64-bits enviroment

rpmbuild --target=i386 -bb your.spec

Extract RPM file

rpm2cpio your.rpm | cpio -idmv

Specified the .so file path you want to link to

-Wl,-rpath,./lib

The fastest way to get time in millisecond on linux

"gettimeofday()" is a great function to get time in millisecond.

Sample usage:

struct timeval start, end;

gettimeofday(&start, NULL);
usleep(2000);
gettimeofday(&end, NULL);

printf("%ld milliseconds\n", ((end.tv_sec-start.tv_sec) * 1000 + (end.tv_usec-start.tv_usec)/1000.0));

Moreover, we can even speed up this function!

According to this post, we can enable Virtual Dynamic Shared Object to speed things up.

# echo 2 > /proc/sys/kernel/vsyscall64

FastCGI: non-blocking FCGI_Accept_r

1. FCGX_InitRequest(&request, 0, FCGI_FAIL_ACCEPT_ON_INTR)

2.

int flags = fcntl(0, F_GETFL, 0);

fcntl(0, F_SETFL, flags | O_NONBLOCK);

3. sigaction

"We intentionally try to set the SA_RESTART flag for all signals other than SIGALRM, so that any system call interrupted by these other signals is automatically restarted. The reason we don't want SIGALRM restarted is to allow us to set a timeout for I/O operations."

Today: Terms to remember

c++: const reference is your friend

Terms to remember

C++ exception safe:

Copy-and-Swap trick