git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@566 35acf78f-673a-0410-8e92-d51de3d6d3f4
gdisirio
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docs/ch.txt
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docs/ch.txt
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@ -79,7 +79,7 @@
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* priority is executed. If more than one thread with equal priority are
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* eligible for execution then they are executed in a round-robin way, the
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* CPU time slice constant is configurable. The ready list is a double linked
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* list of threads ordered by priority.
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* list of threads ordered by priority.<br><br>
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* @image html readylist.png
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* Note that the currently running thread is not in the ready list, the list
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* only contains the threads ready to be executed but still actually waiting.
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@ -89,19 +89,26 @@
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* @image html states.png
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*
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* @section warea Thread Working Area
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* Each thread has its own stack, a Thread structure and a registers dump
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* structure. All the structures are allocated into a "Thread working area",
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* Each thread has its own stack, a Thread structure and some preemption
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* areas. All the structures are allocated into a "Thread working area",
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* a thread private heap, usually allocated in a char array declared in your
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* code, there is not a central threads table or list, this means you can
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* have as many threads you want as long you have enough available RAM
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* memory. The threads do not use any memory outside the allocated working
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* area.<br>
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* area.<br><br>
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* @image html workspace.png
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* <br>
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* Note that the registers dump is only present when the Thread is not
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* running, the context switching is done by pushing the registers on the
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* stack of the switched-out thread and popping the registers of the
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* switched-in thread from its stack.
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* Note that the preemption areas only present when the Thread is not
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* running (switched out), the context switching is done by pushing the
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* registers on the stack of the switched-out thread and popping the registers
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* of the switched-in thread from its stack.
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* The preemption areas can be divided in up to three structures:
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* - External Context.
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* - Interrupt Stack.
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* - Internal Context.
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*
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* See the @ref Core documentation for details, the areas may change on
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* the various ports and some structures may not be present (or be zero-sized).
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*
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* @section sysmutex System Mutex Zone
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* It is the code within the OS that cannot be preempted, this code is
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transform="translate(131.71875,-62.610866)"><flowRegion
|
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transform="translate(125.4043,-62.808117)"><flowRegion
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id="flowRegion3251"><rect
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id="rect3253"
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width="97.01046"
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height="17.563538"
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|
||||
height="12.563538"
|
||||
x="2.9895365"
|
||||
y="332.43646" /></flowRegion><flowPara
|
||||
id="flowPara3255">Thread Structure</flowPara></flowRoot> <flowRoot
|
||||
xml:space="preserve"
|
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id="flowRoot3257"
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transform="translate(136.05664,-274.98977)"><flowRegion
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||||
transform="translate(133.58398,-197.80812)"><flowRegion
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id="flowRegion3259"><rect
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id="rect3261"
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width="97.01046"
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width="102.01046"
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height="17.563538"
|
||||
x="2.9895365"
|
||||
y="332.43646" /></flowRegion><flowPara
|
||||
id="flowPara3263">Registers Dump</flowPara></flowRoot> <flowRoot
|
||||
id="flowPara3263">intctx Structure</flowPara></flowRoot> <flowRoot
|
||||
xml:space="preserve"
|
||||
id="flowRoot3265"
|
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transform="translate(141.71875,-307.61087)"><flowRegion
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transform="translate(137.71094,-292.80812)"><flowRegion
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id="flowRegion3267"><rect
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id="rect3269"
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width="97.01046"
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|
|
@ -189,7 +189,7 @@
|
|||
id="flowPara3273">Thread Stack</flowPara></flowRoot> <flowRoot
|
||||
xml:space="preserve"
|
||||
id="flowRoot3277"
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transform="translate(0.4335938,-258.72805)"><flowRegion
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transform="translate(1.2089844,-187.09523)"><flowRegion
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id="flowRegion3279"><rect
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id="rect3281"
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width="97.01046"
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|
|
@ -202,7 +202,7 @@
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id="path3487" />
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<path
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style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.6978516px;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow1Mend);stroke-opacity:1"
|
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d="M 100.16177,81.570166 C 109.12769,81.570166 109.12769,81.570166 109.12769,81.570166"
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d="M 100.34893,148.42983 C 109.31485,148.42983 109.31485,148.42983 109.31485,148.42983"
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id="path3489" />
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<path
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style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.6978516px;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow1Mend);stroke-opacity:1"
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|
|
@ -218,10 +218,10 @@
|
|||
<flowRoot
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xml:space="preserve"
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id="flowRoot2208"
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transform="translate(122.00391,-93.728054)"><flowRegion
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transform="translate(112.03516,-92.095227)"><flowRegion
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y="332.43646" /></flowRegion><flowPara
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@ -239,5 +239,47 @@
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height="17.563538"
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x="2.9895365"
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y="332.43646" /></flowRegion><flowPara
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id="flowPara2224">chThdLS()</flowPara></flowRoot> </g>
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id="flowPara2224">chThdLS()</flowPara></flowRoot> <flowRoot
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xml:space="preserve"
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id="flowRoot2209"
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transform="translate(2.3710937,-107.80812)"><flowRegion
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y="332.43646" /></flowRegion><flowPara
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id="flowPara2215">Stack Limit</flowPara></flowRoot> <path
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id="path2217" />
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<path
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style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:1, 1;stroke-dashoffset:0;stroke-opacity:1"
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d="M 110.42716,125.5 C 249.5,125.5 249.5,125.5 249.5,125.5"
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id="path2221" />
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<path
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style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:1, 1;stroke-dashoffset:0;stroke-opacity:1"
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d="M 110.42716,100.5 C 249.5,100.5 249.5,100.5 249.5,100.5"
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id="path2223" />
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<flowRoot
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xml:space="preserve"
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transform="translate(130.04492,-248.01905)"><flowRegion
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id="flowRegion2227"><rect
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id="rect2229"
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y="332.43646" /></flowRegion><flowPara
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id="flowPara2231">extctx Structure</flowPara></flowRoot> <flowRoot
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xml:space="preserve"
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id="flowRoot2235"
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transform="translate(110.82227,-224.75538)"><flowRegion
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id="flowRegion2237"><rect
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id="rect2239"
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y="332.43646" /></flowRegion><flowPara
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id="flowPara2241">INT_REQUIRED_STACK</flowPara></flowRoot> </g>
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</svg>
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|
Before Width: | Height: | Size: 9.5 KiB After Width: | Height: | Size: 12 KiB |
|
|
@ -88,12 +88,19 @@ void chSysUnlock(void) {
|
|||
}
|
||||
|
||||
/**
|
||||
* Context switch.
|
||||
* Performs a context switch.
|
||||
* This is the most critical code in any port, this function is responsible
|
||||
* for the context switch between 2 threads.
|
||||
* @param otp the thread to be switched out
|
||||
* @param ntp the thread to be switched in
|
||||
* @note The implementation of this code affects <b>directly</b> the context
|
||||
* switch performance so optimize here as much as you can.
|
||||
*/
|
||||
void chSysSwitchI(Thread *otp, Thread *ntp) {}
|
||||
|
||||
/**
|
||||
* Prints a message on the system console (if any).
|
||||
* @param msg the message to be printed on the system console
|
||||
*/
|
||||
void chSysPuts(char *msg) {
|
||||
}
|
||||
|
|
|
|||
|
|
@ -32,27 +32,39 @@
|
|||
|
||||
/**
|
||||
* Base type for stack alignment.
|
||||
* This type is used only for stack alignment reasons thus can be anything from
|
||||
* a char to a double.
|
||||
*/
|
||||
typedef uint8_t stkalign_t;
|
||||
|
||||
/**
|
||||
* Interrupt saved context.
|
||||
* This structure represents the stack frame saved during a preemption-capable
|
||||
* interrupt handler.
|
||||
*/
|
||||
struct extctx {
|
||||
};
|
||||
|
||||
/**
|
||||
* System saved context.
|
||||
* This structure represents the inner stack frame during a context switching.
|
||||
*/
|
||||
struct intctx {
|
||||
};
|
||||
|
||||
/**
|
||||
* Platform dependent part of the @p Thread structure.
|
||||
* This structure usually contains just the saved stack pointer defined as a
|
||||
* pointer to a @p intctx structure.
|
||||
*/
|
||||
typedef struct {
|
||||
struct intctx *sp;
|
||||
} Context;
|
||||
|
||||
/**
|
||||
* Platform dependent part of the \p chThdCreate() API.
|
||||
* This code usually setup the context switching frame represented by a
|
||||
* @p intctx structure.
|
||||
*/
|
||||
#define SETUP_CONTEXT(workspace, wsize, pf, arg) \
|
||||
{ \
|
||||
|
|
@ -60,12 +72,18 @@ typedef struct {
|
|||
|
||||
/**
|
||||
* Stack size for the system idle thread.
|
||||
* This size depends on the idle thread implementation, usually the idle
|
||||
* thread should take no more space than those reserved
|
||||
* by @p INT_REQUIRED_STACK.
|
||||
*/
|
||||
#define IDLE_THREAD_STACK_SIZE 0
|
||||
|
||||
/**
|
||||
* Per-thread stack overhead for interrupts servicing, it is used in the
|
||||
* calculation of the correct working area size.
|
||||
* This value can be zero on those architecture where there is a separate
|
||||
* interrupt stack and the stack space between @p intctx and @p extctx is
|
||||
* known to be zero.
|
||||
*/
|
||||
#define INT_REQUIRED_STACK 0
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue