Linux multi-thread Signal

Linux multi-thread signal-Linux general technology-Linux programming and kernel information. The following is a detailed description. In POSIX.1 model, after an asynchronous signal is sent to a process, a thread in the process that does not block the signal is selected to receive the signal. When implementing an application based on the event model, you can use pthread_sigmash to block those signals. But linux does not comply with this rule. linux threads are independent. When we use the POSIX model to send signals to processes, we will find that the signals are lost.

The solution to this problem is to directly send a signal to the thread. Use the gettid function to obtain the thread id. Because glibc does not provide gettid, You Need To encapsulate it yourself, as shown below.

# Include
Pid_t gettid ()
{
Return syscall (SYS_gettid );
}