Thread - Revision history

Jnc: Kernel threads; threads usually have stacks

2023-12-15T16:25:39Z

Kernel threads; threads usually have stacks

Jnc: +cat

2018-12-16T21:13:51Z

+cat

Jnc: Add fate-sharing

2018-10-31T12:58:06Z

Add fate-sharing

Jnc: An OK start

2018-10-30T20:22:32Z

An OK start

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The term '''thread''' does not have a generally accepted firm/strict definition, but it generally means an [[instruction]] [[execute|execution]] locus which is less powerful (in terms of its capabilities) than a [[process]]; e.g. a thread will generally not have its own [[address space]].

Threads are usually instantiated within a process, and share its [[memory]], [[input/output|I/O]] channels, etc. They are often, but not always, supported by the [[kernel]] of an [[operating system]]; e.g. the system's [[scheduler]] may be prepared to run threads. If not, a [[library]] included in the process may manage them.

In [[multi-processor]] systems where the kernel supports threads, it may be allowed for multiple threads in a single process to execute concurrently.

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 The term '''thread''' does not have a generally accepted firm/strict definition, but it generally means an [[instruction]] [[execute|execution]] locus which is less powerful (in terms of its capabilities) than a [[process]]; e.g. a thread will generally not have its own [[address space]].
-Threads are usually instantiated within a process, and share its [[memory]], [[input/output|I/O]] channels, etc. All the threads in a particular process exhibit [[fate-sharing]]: if the process is terminated, all the threads within it necessarily are also lost.
+Threads are usually instantiated within a process, and share its [[memory]], [[input/output|I/O]] channels, etc. Threads do seem to usually have individual, per-thread, [[stack]]s, so that a thread can cease executing while down a [[subroutine call]] chain, and later resume executing at the exact point where it paused. (Thread-like abstractions without stacks are sometimes called '''fibers'''.)
 Threads are often, but not always, supported by the [[kernel]] of an [[operating system]]; e.g. the system's [[scheduler]] may be prepared to run threads. If not, a [[library]] included in the process may manage them.
 In [[multi-processor]] systems where the kernel supports threads, it may be allowed for multiple threads in a single process to execute concurrently.
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 [[Category: OS Basics]]

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