Threads - Revision history

Kindman at 15:57, 29 July 2020

2020-07-29T15:57:00Z

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 == Thread definition in AMC-OS ==
-A thread is an execution unit running in the context of a specific [[Processes|process]]. It is consequently limited to the address space, code, data and execution rights of its [[Processes|parent process]].
+A thread is an execution unit running in the context of a specific [[Processes|process]]. It is consequently limited to the address space, code, data and execution rights of its [[Processes|parent process]]. If we refer to x86 architecture, a thread is the same as a task.
 A thread is characterized by :
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 To get the TSI_ENTRY for a specific iTID, an index table called <code>TSI_QuickTable</code> is maintained.

Kindman at 15:28, 29 July 2020

2020-07-29T15:28:28Z

← Older revision		Revision as of 17:28, 29 July 2020
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	Each process is defined by a <code>TSI_ENTRY</code> containing all thread information.		Each process is defined by a <code>TSI_ENTRY</code> containing all thread information.

	=== Thread ID (~~ITID~~ and ~~GTID~~) ===		=== Thread ID (iTID and TID) ===

	An internal thread ID (~~ITID~~) is a 16-bit unsigned integer, uniquely assigned to each thread in the whole system, with a maximum of <code>TSI_MAX_THREADS</code>. The global thread ID (~~GTID~~) is a 32-bit unsigned integer composed of the PID in the 16 upper bits, and of the ITID in the 16 lower bits.		An internal thread ID (iTID) is a 16-bit unsigned integer, uniquely assigned to each thread in the whole system, with a maximum of <code>TSI_MAX_THREADS</code>. The global thread ID (TID) is a 32-bit unsigned integer composed of the PID in the 16 upper bits, and of the ITID in the 16 lower bits.

	TSI maintains a linked list of unsorted used and free ~~TIDs~~, allowing allocation and release of ~~TIDs~~ in ''O(1)'', by respectively removing or adding the ~~TID~~ at the beginning of the list.		TSI maintains a linked list of unsorted used and free iTIDs, allowing allocation and release of iTIDs in ''O(1)'', by respectively removing or adding the iTID at the beginning of the list.
	Both list share the same global table called <code>StatusTable</code> with two initial pointers, one for the linked list of free entries (<code>firstFreeEntry</code>), one for the linked list of used entries (<code>firstUsedEntry</code>).		Both list share the same global table called <code>StatusTable</code> with two initial pointers, one for the linked list of free entries (<code>firstFreeEntry</code>), one for the linked list of used entries (<code>firstUsedEntry</code>).

	Internal functions for ~~TID~~ management are :		Internal functions for iTID management are :
	* ~~ITID~~ TSI_AllocateTID(TSI_ENTRY *)		* iTID TSI_AllocateTID(TSI_ENTRY *)
	* void TSI_ReleaseTID(~~ITID~~)		* void TSI_ReleaseTID(iTID)

	To get the TSI_ENTRY for a specific ~~ITID~~, an index table called <code>TSI_QuickTable</code> is maintained.		To get the TSI_ENTRY for a specific iTID, an index table called <code>TSI_QuickTable</code> is maintained.

Kindman at 15:24, 29 July 2020

2020-07-29T15:24:44Z

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 A thread is an execution unit running in the context of a specific [[Processes|process]]. It is consequently limited to the address space, code, data and execution rights of its [[Processes|parent process]].
 A thread is characterized by :
 * a task state segment (TSS) containing CPU state (registers, stack, ...)
 * scheduling data (priority flag, counter of total and remaining active time...)
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 == Threads System Interface (TSI) ==

Kindman: Created page with "A thread is an execution unit running in the context of a specific process. It is consequently limited to the address space, code, data and execution rights of i..."

2020-07-29T15:19:36Z

Created page with "A thread is an execution unit running in the context of a specific process. It is consequently limited to the address space, code, data and execution rights of i..."

New page

A thread is an execution unit running in the context of a specific [[Processes|process]]. It is consequently limited to the address space, code, data and execution rights of its [[Processes|parent process]].

A thread is characterized by :
* a task state segment (TSS) containing CPU state (registers, stack, ...)
* scheduling data (priority flag, counter of total and remaining active time...)
* a list of events related to the thread

Threads are managed by the TSI module ''(Threads System Interface)''.

== Threads System Interface (TSI) ==