X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fkern%2Fproc_p.h;h=85cb758f9ecfd7472ea540a3547bb2261fa5717b;hb=34a467fa89d01c8248fabc52bc5a4f5edf67570a;hp=8fbb0ed0a723d8ddd5a440c09f8fb519f6c795a6;hpb=791e167e053bdd9250d34a9a5ccae6ccde4d6679;p=bertos.git diff --git a/bertos/kern/proc_p.h b/bertos/kern/proc_p.h index 8fbb0ed0..85cb758f 100644 --- a/bertos/kern/proc_p.h +++ b/bertos/kern/proc_p.h @@ -27,59 +27,53 @@ * the GNU General Public License. * * Copyright 2001, 2004 Develer S.r.l. (http://www.develer.com/) - * Copyright 1999, 2000, 2001 Bernardo Innocenti + * Copyright 1999, 2000, 2001 Bernie Innocenti * * --> * * \brief Internal scheduler structures and definitions for processes. * * \version $Id$ - * - * \author Bernardo Innocenti + * \author Bernie Innocenti */ #ifndef KERN_PROC_P_H #define KERN_PROC_P_H -#include -#include /* for cpu_stack_t */ -#include -#include -#include - -typedef struct Process -{ - Node link; /**< Link Process into scheduler lists */ - cpustack_t *stack; /**< Per-process SP */ - iptr_t user_data; /**< Custom data passed to the process */ +#include "cfg/cfg_proc.h" +#include "cfg/cfg_monitor.h" -#if CONFIG_KERN_SIGNALS - sigmask_t sig_wait; /**< Signals the process is waiting for */ - sigmask_t sig_recv; /**< Received signals */ -#endif +#include -#if CONFIG_KERN_PREEMPTIVE - int forbid_cnt; /**< Nesting count for proc_forbid()/proc_permit(). */ -#endif +#include /* for cpu_stack_t */ +#include // IRQ_ASSERT_DISABLED() -#if CONFIG_KERN_HEAP - uint16_t flags; /**< Flags */ - cpustack_t *stack_base; /**< Base of process stack */ - size_t stack_size; /**< Size of process stack */ -#endif +#include // struct Process -#if CONFIG_KERN_MONITOR - struct ProcMonitor - { - Node link; - const char *name; - cpustack_t *stack_base; - size_t stack_size; - } monitor; -#endif - -} Process; +/** + * CPU dependent context switching routines. + * + * Saving and restoring the context on the stack is done by a CPU-dependent + * support routine which usually needs to be written in assembly. + */ +EXTERN_C void asm_switch_context(cpu_stack_t **new_sp, cpu_stack_t **save_sp); +/* + * Save context of old process and switch to new process. + */ +INLINE void proc_switchTo(Process *next, Process *prev) +{ + cpu_stack_t *dummy; + + if (UNLIKELY(next == prev)) + return; + /* + * If there is no old process, we save the old stack pointer into a + * dummy variable that we ignore. In fact, this happens only when the + * old process has just exited. + */ + asm_switch_context(&next->stack, prev ? &prev->stack : &dummy); +} /** * \name Flags for Process.flags. @@ -90,31 +84,119 @@ typedef struct Process /** Track running processes. */ -extern REGISTER Process *CurrentProcess; +extern REGISTER Process *current_process; -/** Track ready processes. */ -extern REGISTER List ProcReadyList; +/** + * Track ready processes. + * + * Access to this list must be performed with interrupts disabled + */ +extern REGISTER List proc_ready_list; + +#if CONFIG_KERN_PRI + #define prio_next() (LIST_EMPTY(&proc_ready_list) ? INT_MIN : \ + ((PriNode *)LIST_HEAD(&proc_ready_list))->pri) + #define prio_proc(proc) (proc->link.pri) + #define prio_curr() prio_proc(current_process) + + #define SCHED_ENQUEUE_INTERNAL(proc) \ + LIST_ENQUEUE(&proc_ready_list, &(proc)->link) + #define SCHED_ENQUEUE_HEAD_INTERNAL(proc) \ + LIST_ENQUEUE_HEAD(&proc_ready_list, &(proc)->link) +#else + #define prio_next() 0 + #define prio_proc(proc) 0 + #define prio_curr() 0 + + #define SCHED_ENQUEUE_INTERNAL(proc) ADDTAIL(&proc_ready_list, &(proc)->link) + #define SCHED_ENQUEUE_HEAD_INTERNAL(proc) ADDHEAD(&proc_ready_list, &(proc)->link) +#endif + +/** + * Enqueue a process in the ready list. + * + * Always use this macro to instert a process in the ready list, as its + * might vary to implement a different scheduling algorithms. + * + * \note Access to the scheduler ready list must be performed with + * interrupts disabled. + */ +#define SCHED_ENQUEUE(proc) do { \ + IRQ_ASSERT_DISABLED(); \ + LIST_ASSERT_VALID(&proc_ready_list); \ + SCHED_ENQUEUE_INTERNAL(proc); \ + } while (0) + +#define SCHED_ENQUEUE_HEAD(proc) do { \ + IRQ_ASSERT_DISABLED(); \ + LIST_ASSERT_VALID(&proc_ready_list); \ + SCHED_ENQUEUE_HEAD_INTERNAL(proc); \ + } while (0) + + +#if CONFIG_KERN_PRI +/** + * Changes the priority of an already enqueued process. + * + * Searches and removes the process from the ready list, then uses LIST_ENQUEUE(() + * to insert again to fix priority. + * + * No action is performed for processes that aren't in the ready list, eg. in semaphore queues. + * + * \note Performance could be improved with a different implementation of priority list. + */ +INLINE void sched_reenqueue(struct Process *proc) +{ + IRQ_ASSERT_DISABLED(); + LIST_ASSERT_VALID(&proc_ready_list); + Node *n; + PriNode *pos = NULL; + FOREACH_NODE(n, &proc_ready_list) + { + if (n == &proc->link.link) + { + pos = (PriNode *)n; + break; + } + } + + // only remove and enqueue again if process is already in the ready list + // otherwise leave it alone + if (pos) + { + REMOVE(&proc->link.link); + LIST_ENQUEUE(&proc_ready_list, &proc->link); + } +} +#endif //CONFIG_KERN_PRI +/* Process trampoline */ +void proc_entry(void); -/** Enqueue a task in the ready list. */ -#define SCHED_ENQUEUE(proc) ADDTAIL(&ProcReadyList, &(proc)->link) +/* Schedule another process *without* adding the current one to the ready list. */ +void proc_switch(void); -/** Schedule to another process *without* adding the current to the ready list. */ +/* Low level scheduling routine. */ void proc_schedule(void); +/* Low level context switch routine. */ +void proc_switchTo(Process *next, Process *prev); + +/* Initialize a scheduler class. */ +void proc_schedInit(void); + #if CONFIG_KERN_MONITOR /** Initialize the monitor */ void monitor_init(void); /** Register a process into the monitor */ - void monitor_add(Process *proc, const char *name, cpustack_t *stack, size_t stacksize); + void monitor_add(Process *proc, const char *name); /** Unregister a process from the monitor */ void monitor_remove(Process *proc); /** Rename a process */ - void monitor_rename(Process *proc, const char* name); + void monitor_rename(Process *proc, const char *name); #endif /* CONFIG_KERN_MONITOR */ #endif /* KERN_PROC_P_H */ -