Imbus/xv6-riscv-kernel
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Change dev read/write functions

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to take inode* instead of minor number.

Unlock console inode during console_read
and console_write.  Otherwise background
processes cannot write to console while the
shell is reading it waiting for input.
This commit is contained in:
rsc 2007-08-28 17:49:49 +00:00
parent e3f271e880
commit d844f0f9d9
3 changed files with 12 additions and 7 deletions
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11
console.c
View file

@ -164,14 +164,16 @@ cprintf(char *fmt, ...)
}
int
console_write(int minor, char *buf, int n)
console_write(struct inode *ip, char *buf, int n)
{
int i;
iunlock(ip);
acquire(&console_lock);
for(i = 0; i < n; i++)
cons_putc(buf[i] & 0xff);
release(&console_lock);
ilock(ip);
return n;
}
@ -230,17 +232,19 @@ console_intr(int (*getc)(void))
}
int
console_read(int minor, char *dst, int n)
console_read(struct inode *ip, char *dst, int n)
{
uint target;
int c;
iunlock(ip);
target = n;
acquire(&input.lock);
while(n > 0){
while(input.r == input.w){
if(cp->killed){
release(&input.lock);
ilock(ip);
return -1;
}
sleep(&input.r, &input.lock);
@ -262,6 +266,7 @@ console_read(int minor, char *dst, int n)
input.r = 0;
}
release(&input.lock);
ilock(ip);
return target - n;
}
@ -274,7 +279,7 @@ console_init(void)
devsw[CONSOLE].write = console_write;
devsw[CONSOLE].read = console_read;
use_console_lock = 1;
//use_console_lock = 1;
irq_enable(IRQ_KBD);
ioapic_enable(IRQ_KBD, 0);