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Commit 93b127d

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Improved logic of flock.

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lines changed

multithreading
- 02 - Flock.c

1 file changed

+12

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`‎multithreading/02 - Flock.c`

Lines changed: 12 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -25,7 +25,12 @@ int lock_write()`
`25`	`25`	`return 0;`
`26`	`26`	`}`
`27`	`27`
`28`		`- flock(fd, LOCK_EX \| LOCK_NB);`
	`28`	`+ if (flock(fd, LOCK_EX \| LOCK_NB) < 0)`
	`29`	`+ {`
	`30`	`+ printf("Access to LOCK error.\n");`
	`31`	`+ close(fd);`
	`32`	`+ return 0;`
	`33`	`+ }`
`29`	`34`
`30`	`35`	`const char buf[] = "ABRACADABRA";`
`31`	`36`	`write(fd, &buf, strlen(buf) + 1);`
`@@ -47,7 +52,12 @@ int lock_read(pid_t pid)`
`47`	`52`	`return 0;`
`48`	`53`	`}`
`49`	`54`
`50`		`- flock(fd, LOCK_SH \| LOCK_NB);`
	`55`	`+ if (flock(fd, LOCK_SH \| LOCK_NB) < 0)`
	`56`	`+ {`
	`57`	`+ printf("Access to LOCK error.\n");`
	`58`	`+ close(fd);`
	`59`	`+ return 0;`
	`60`	`+ }`
`51`	`61`
`52`	`62`	`char buf[12];`
`53`	`63`	`read(fd, &buf, 12);`

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