I have a multithreaded PHP application that uses sockets for communicating between threads. The communication works pretty well, except for one thing: when I call socket_select(), it works the first time after a new connection is made, but after that it always reports read handles ready, even after I've read all the data from them. Here's what I mean:
Main thread:
- Setup socket, bind to port, listen
- socket_select() (block, with null timeout to make it wait forever) on the socket from step 1
- That call works fine: after the child thread connects, socket_select() tells me that the socket from step 1 is ready
- Accept new connection, remember the handle returned by accept().
- socket_select() on the main socket plus the new socket
- After child thread writes, socket_select() reports that the new socket is ready
- I read all the data from the socket, then go back to step 5.
At this point, socket_select() continues to report that the new socket is ready, even though the child thread has written no new data to it. What in the world am I doing wrong? Is it convention to close the new connection at this point and have the child thread reconnect? How can I get socket_select() to stop reporting that the new handle is ready to read?