#include "config.h"
#include <sys/critsec.h>
#include <critsec.h>
#include <unistd.h>
#include <sys/tm.h>
#include <tm.h>
Go to the source code of this file.
Functions | |
int | locked_check_and_increment (atomic_t *counter, tdata_t **tid) |
check and increment counter, without interruptions | |
__asm__ ("\n\ .text\n\ .global _locked_check_and_increment\n\ _locked_check_and_increment:\n\ push.w r4\n\ stc ccr, r4h\n\ orc #0x80, ccr\n\ mov.b @r0, r4l\n\ beq lci_get_lock\n\ \n\ push.w r2\n\ push.w r3\n\ mov.w @_ctid, r2\n\ mov.w @r1, r3\n\ sub.w r3, r2\n\ bne lci_cant_lock\n\ \n\ pop.w r3\n\ pop.w r2\n\ bra lci_get_lock\n\ \n\ lci_cant_lock:\n\ pop.w r3\n\ pop.w r2\n\ mov.w #0xffff, r0\n\ bra lci_done\n\ \n\ lci_get_lock:\n\ inc r4l\n\ mov.b r4l, @r0\n\ mov.w @_ctid, r0 \n\ mov.w r0, @r1 \n\ sub.w r0, r0\n\ \n\ lci_done:\n\ ldc r4h, ccr\n\ pop.w r4\n\ rts\n\ ") | |
wakeup_t | wait_critical_section (wakeup_t data) |
wakeup when critical section is available | |
int | enter_critical_section (critsec_t *cs) |
lock a critical section, or wait until it is available. |
Variables | |
atomic_t | kernel_critsec_count |
critical section counter for kernel/task manager |
__asm__ | ( | "\n\.text\n\.global _locked_check_and_increment\n\ _locked_check_and_increment:\n\ push.w r4\n\ stc | ccr, |
r4h\n\orc# | 0x80, | ||
ccr\n\mov.b @ | r0, | ||
r4l\n\beq lci_get_lock\n\\n\push.w r2\n\push.w r3\n\mov.w @ | _ctid, | ||
r2\n\mov.w @ | r1, | ||
r3\n\sub.w | r3, | ||
r2\n\bne lci_cant_lock\n\\n\pop.w r3\n\pop.w r2\n\bra lci_get_lock\n\\n\lci_cant_lock:\n\pop.w r3\n\pop.w r2\n\mov.w# | 0xffff, | ||
r0\n\bra lci_done\n\\n\lci_get_lock:\n\inc r4l\n\mov.b | r4l, | ||
@r0\n\mov.w @ | _ctid, | ||
r0\n\mov.w | r0, | ||
@r1\n\sub.w | r0, | ||
r0\n\\n\lci_done:\n\ldc | r4h, | ||
ccr\n\pop.w r4\n\rts\n\" | |||
) |
int enter_critical_section | ( | critsec_t * | cs | ) |
lock a critical section, or wait until it is available.
enter critical section
check and lock critical section if it is available; otherwise, wait until it is available, then lock it.
cs | pointer to critical section (critsec_t) |
Definition at line 96 of file critsec.c.
References critsec::count, locked_check_and_increment(), critsec::task, wait_critical_section(), and wait_event().
Referenced by CriticalSectionBlock::CriticalSectionBlock().
check and increment counter, without interruptions
increments counter if count is already zero, or if this is the same task as the one that made it one.
used to enter a normal critical section.
counter | pointer to counter to be incremented |
tid | pointer to pointer to receive task pointer of the task that has locked the resource |
Referenced by enter_critical_section(), and wait_critical_section().
wakeup when critical section is available
wakeup function used to detect when a critical section is available. called while processing an interrupt, so interrupts are already disabled.
Definition at line 78 of file critsec.c.
References critsec::count, locked_check_and_increment(), and critsec::task.
Referenced by enter_critical_section().
atomic_t kernel_critsec_count |
critical section counter for kernel/task manager
when the critical section counter is Zero, task swapping is allowed. when greater than zero, task swapping is not allowed. This is checked in the task_switch_handler() in systime.c
brickOS is released under the
Mozilla Public License.
Original code copyright 1998-2005 by the authors. |