What does linux thread mean?

Linux thread is an execution branch within the process, and the thread magnitude is very small. All processes have at least one thread. Resources shared by threads: 1. User ID and group ID; 2. Current working directory; 3. The same address space; 4. The processing method of each signal.

The definition of thread

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Thread is inside the process An execution branch, the thread size is very small (the so-called internal means running in the address space of the process).

All processes have at least one thread.

Thread-shared resources

• The same address space

• File descriptor table ()

• The processing method of each signal (such as: SIG_DFL, SIG_IGN or customized signal priority)

• Current working directory

• User id and group id

Thread-independent resources

• The thread will generate temporary variables, and the temporary variables are saved on the stack, so Each thread has its own private stack structure

• Each thread has private context information.

• Thread ID

• The value of a set of registers

• errno variable

• Signal masking words and scheduling priority

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