©2004 by Marc J. Rochkind. All rights reserved. Portions marked "Open Source" may be copied under license.

 

                 

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c7/f2.c File Reference

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Detailed Description

File locking (semaphore) [Sec. 7.11.2].

Definition in file f2.c.

Go to the source code of this file.

Compounds
struct	rec
Defines
#define	DBNAME   "termdb"
Functions
bool	readrec (int dbfd, struct rec *r, off_t off)
bool	writerec (int dbfd, struct rec *r, off_t off)
bool	store (int dbfd, int data)
void	process1 (void)
void	process2 (void)
int	main (void)
Variables
SimpleSem *	sem

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Define Documentation

#define DBNAME   "termdb"

Definition at line 97 of file f2.c.

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Function Documentation

int main (  void   )

Definition at line 158 of file f2.c. References EC_CLEANUP_BGN, EC_CLEANUP_END, ec_false, ec_neg1, exit(), fork(), process1(), process2(), SimpleSemRemove(), and waitpid().

void process1 (  void   )  [static]

Definition at line 99 of file f2.c. References close(), DBNAME, EC_CLEANUP_BGN, EC_CLEANUP_END, ec_false, ec_neg1, ec_null, exit(), open(), PERM_FILE, sem, SimpleSemClose(), SimpleSemOpen(), SimpleSemPost(), store(), and writerec().

void process2 (  void   )  [static]

Definition at line 119 of file f2.c. References close(), DBNAME, EC_CLEANUP_BGN, EC_CLEANUP_END, EC_FAIL, ec_false, ec_neg1, ec_null, errno, exit(), open(), rec::r_data, rec::r_next, readrec(), sem, SimpleSemClose(), SimpleSemOpen(), SimpleSemPost(), and SimpleSemWait().

bool readrec (  int  dbfd, struct rec *  r, off_t  off )

Definition at line 31 of file f2.c. References EC_CLEANUP_BGN, EC_CLEANUP_END, EC_FAIL, errno, and pread().

bool store (  int  dbfd, int  data )

Definition at line 65 of file f2.c. References EC_CLEANUP_BGN, EC_CLEANUP_END, ec_false, ec_neg1, lseek(), rec::r_data, rec::r_next, readrec(), sem, SimpleSemPost(), SimpleSemWait(), usleep(), and writerec().

bool writerec (  int  dbfd, struct rec *  r, off_t  off )

Definition at line 48 of file f2.c. References EC_CLEANUP_BGN, EC_CLEANUP_END, EC_FAIL, errno, and pwrite().

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Variable Documentation

struct SimpleSem* sem [static]

Definition at line 24 of file f2.c. Referenced by process1(), process2(), and store().

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