Problem: In many applications, we have a number of processes trying to write into a single file. If any two processes open a file to append something to the file (think of logs as an example), the exact timing at which the file is closed becomes extremely important. This is the critical section problem.
For this assignment, we are going to simulate the writing of logs. In a nutshell, the problem can be specified as follows.There is a process who reads from a single text file, picks up the next line of text, and puts it in a single buffer. Let there be five buffers and our producer process keeps on trying to fill those five buffers. Then, this process sets a flag to indicate that one of the five buffers is full. The process can write into a buffer only if the buffer is empty. There are a number of other processes (consumers) who keep on looking for a buffer to become full. One of these processes should be able to pick up the text in the buffer and write it into the log file. The process must make sure that the file is not opened by another process for writing
Master will create one producer process and then continuously create consumer processes until the number of conumers that was specified is created.
The producer when in it's critical section will fill any of the 5 buffers that are empty with data from data.txt.
The consumer when in its critical section will read data from the first full buffer, then exit and get in line to read more data at a later time.
When the program should terminate becuase all data from data.txt has been read, or becuase of a SIGINT or SIGALRM signal then an end_program flag in shared memory will be flipped. All processes continuously check this flag, and if it is true will terminate.
To build this program run:
make
To run the program:
./master [-n number of consumers]
If no -n flag is provided, then the default will be 10.
To remove all object and binary files run:
make clean
To remove all log files run:
rm *.log
46c2bf0 2018-05-06 16:04:05 -0500 Add flipping end program flag print statements to master
ef2a8c0 2018-05-06 15:58:13 -0500 Add executables to make clean target
139ea46 2018-05-06 15:57:02 -0500 Improve make clean target
f0ddbef 2018-05-06 15:54:19 -0500 Improve format of log statements
86188a0 2018-05-06 15:36:48 -0500 Rename signal handlers
0f13771 2018-05-06 15:35:55 -0500 Rename signal handlers
3ff594b 2018-05-06 15:29:48 -0500 Remove print debug statements from consumer
fbbca4d 2018-05-06 15:27:23 -0500 Remove unneeded code from producer
c2d542f 2018-05-06 15:25:28 -0500 Remove unneeded code from master
1aba436 2018-05-06 13:02:13 -0500 Debugged peterson's and sigint handling
9a889b8 2018-05-05 15:35:44 -0500 Improve logging
10b6a05 2018-05-05 15:26:06 -0500 Cleanup consumer code
00e528e 2018-05-05 15:15:51 -0500 Refactor signal handlers
7da5832 2018-05-04 20:08:18 -0500 Develop producer
4931f56 2018-05-04 18:46:40 -0500 Add more robust code to master
95a84f3 2018-04-11 06:10:48 -0500 Cleanup to compile on hoare
6842aa9 2018-04-11 06:03:00 -0500 Remove int i in for loop init and uncomment printfs
28d5d03 2018-02-21 18:26:07 -0600 Comment out code to debug
f112225 2018-02-21 00:02:42 -0600 Debug segfault and now debug free
2a04cda 2018-02-20 15:50:30 -0600 Remove debug printfs
e20163e 2018-02-20 15:42:44 -0600 Update .gitignore
cfedbf0 2018-02-20 15:39:37 -0600 Add get_timestamp()
f640055 2018-02-20 14:47:44 -0600 Debug signal handling, start setting up log file writing
166c00b 2018-02-20 11:10:57 -0600 Test peterson's
4a60fea 2018-02-20 10:29:58 -0600 Test shared memory read/write
a7aa67c 2018-02-19 20:51:58 -0600 Implement petersons algorithm in producer.c
daee2cb 2018-02-19 20:25:42 -0600 Add include directory
081a9c4 2018-02-19 20:24:23 -0600 Add include directory
06fa20e 2018-02-19 20:19:26 -0600 Add printf statements to consumer/producer, test, clenup
5773446 2018-02-19 20:11:10 -0600 Rename shmem functions, add global ID_STR_IDX constant
ab97863 2018-02-19 20:00:26 -0600 Consolidate consumer/producer code
5ed6623 2018-02-19 18:56:37 -0600 Add split_string()
c53aa64 2018-02-18 19:23:08 -0600 Add data.txt
9652e83 2018-02-18 18:51:43 -0600 Change SIGTERM to SIGINT
57138ba 2018-02-18 18:11:43 -0600 Add signal handling
02d5944 2018-02-18 13:36:16 -0600 Add detach_shmem()
e2080ee 2018-02-18 13:17:11 -0600 Make clean
81366a7 2018-02-18 13:15:27 -0600 Add petersons and shared_memory.c
0188549 2018-02-18 08:15:22 -0600 Add function.c, add child_idx for consumer
9a39b87 2018-02-17 22:48:46 -0600 Add shared memory stater code
b5001d5 2018-02-17 21:14:49 -0600 Add exec one producer and n consumers functionalilty
2738608 2018-02-17 20:54:38 -0600 Replace tabs with spaces
f679952 2018-02-17 20:17:24 -0600 Edit comment indentation
a3a49cf 2018-02-17 20:15:07 -0600 Add producer and consumer files and update makefile
ece29c4 2018-02-17 20:14:21 -0600 Add producer and consumer files and update makefile
e68001b 2018-02-17 19:43:52 -0600 Update README.md
8927678 2018-02-17 19:41:19 -0600 Add description of problem
b1086ea 2018-02-17 19:37:11 -0600 Initial commit