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The Thread Information Block (TIB) or Thread Environment Block (TEB) is a data structure in Win32 on x86 that stores information about the currently running thread. It descended from, and is backward-compatible on 32-bit systems with, a similar structure in OS/2. [1] The TIB is officially undocumented for Windows 9x.
On the Windows family of operating systems, one can get the current process's ID using the GetCurrentProcessId() function of the Windows API, [11] and ID of other processes using GetProcessId(). [12] Internally, process ID is called a client ID , and is allocated from the same namespace as thread IDs, so these two never overlap.
The TCB is "the manifestation of a thread in an operating system." Each thread has a thread control block. An operating system keeps track of the thread control blocks in kernel memory. [2] An example of information contained within a TCB is: Thread Identifier: Unique id (tid) is assigned to every new thread
For a system with hyperthreading enabled, there is an idle thread for each logical processor. The primary purpose of the idle process and its threads is to eliminate what would otherwise be a special case in the scheduler. Without the idle threads, there could be cases when no threads were runnable (or "Ready" in terms of Windows scheduling ...
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The current process ID (GetCurrentProcessID). The current thread ID (GetCurrentThreadID). The tick count since boot time (GetTickCount). The current time (GetLocalTime).
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