Pthreads Programming
by Bradford Nicholes, Dick Buttlar, and Jacqueline Proulx Farrell


Here are the changes from the February 1998 reprint:


(iii): changed "Jackie Farrell" to "Jacqueline Proulx Farrell"
{2}: addition to the code: new line 1:

#include <stdio.h>

line added before "main":

extern int

and: changed "main()" to "main(void)"

{3}: added a 4th line of code:

return 0;

{9}: added to beginning of code:

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

replaced blank line 4 with:

#include <sys/wait.h>

{10}: line added before "main":

extern int

and: changed "main()" to "main(void)"

and: in line after "/*initialize shared...": changed "0" to "0660"; in
two lines that read "exit()", inserted a "0" between the parens; in
the two "waitpid" lines, added "&" before "status"; changed blank
next-to-last line to read:

return 0;

{11}: line 6 of code: added "fork" in parens after "perror" and "1" in
parens after "exit"; changed line 12 ("exit()") to read "return 0;"

{13}: addition to the code: new line 1:

#include <stdio.h>

line added before "main":

extern int

and: changed "main()" to "main(void)"

{14}: changed blank next-to-last line to read:

return 0;

also added a paragraph after the last one:

The formal prototype of a start routine is
(void*)routine(void*arg). In our code example, we are adding threads
to an existing program (a not atypical scenario) and using the (void
*) cast to quit the compiler. In later examples, we redeclare the
routine to the correct prototype where possible.

(15): reprinted for pagebreak
{18}: addition to the code: new line 1:

#include <stdio.h>

line added before "main(int argc...":

extern int

and changed blank next-to-last line to:

return 0;

{21}: line added before "main":

extern int

and: changed "main()" to "main(void)"; changed line "routine_x()" to:

void routine_x(void)

{23}: added two lines to start of example 1-8:

#include <stdio.h>
#include <9781565921153.h>

line added before "main(int argc...":

extern int

{24}: new next-to-last line in example 1-8:

return 0;

in example 1-9, changed "exit(-1)" to "exit(1)" (line -6)

{25}: same change as to line -6 on p. 24 made to line -5 of example
1-9 on this page

{44}: added new first line to 2-6:

extern int

{45}: new final line of 2-6:

return 0;

{49}: changed blank line 5 of 2-7 to:

extern int

and added a line after "server_comm....":

return 0

(50): reprinted for pagebreak
{55}: 2-9: line added before "main()" (near middle of page):

extern int

and: changed "main()" to "main(void)"; tabbed line "mult(size, row..."
to be under "(column" in the line above; added next-to-last line:

return 0

{56}: 2-10: line added before "main()":

extern int

and: changed "main()" to "main(void)


{57}: 2-10: indented line "/* Wait for peers..."; also, in the
next-to-last para, line -2: added a space between "main" (in itals)
and "routine"

(58): line 1: changed "mallocoutside" to "malloc outside"
(64): next-to-last para., line 2: changed "mutexfor" to "mutex for"

{72}: 3-4: line 8: changed "return 1" to "return 0"; line 12: changed
semicolon after "index" to a comma

{73}: next-to-last line of 3-4: changed "1" to "0"

{74}: 3-5: line 5: changed "1" to "0"; line 7: changed semicolon after
"index" to a comma

{75}: line "break;": tabbed it over to align with the "if" above;
changed last line to "return 0;" and aligned the r with the p in
"9781565921153" above

{78}: added these lines to the beginning of example 3-6:

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>

added to end of #includes:

#include <sys/wait.h>

added before "int   shared...":

#ifndef _POSIX_THREAD_PROCESS_SHARED
#error "This platform does not support process shared mutex"
#endif

line added before "main()":

extern int

and: changed "main()" to "main(void); also, 5 lines below that
("shared_mem_id..."): changed "0" to "0660"

(79): reprinted for pagebreak
{80}: para. 2, line -2: changed ".._signalto" to ".._signal to"

added line to beginning of 3-7:

#include <stdio.h>

line added before "main()":

extern int

and: changed "main()" to "main(void)"; 8 lines below that: moved the
"}" to align with "for" two lines above, and changed the blank line
after the close curly bracket to read:

return 0;

(81): reprinted for pagebreak
{82}: line 3: changed "watch_countprints" to "watch_count prints"
{85}: line 12 of 3-8: changed "return 1;" to "return 0;"
(87): 3-9: changed all the "rwdrp"s to "rdwrp", here and in the text

3-10, line 4: changed "readers_waiting" to "writer_writing" 

3rd line from bottom of page: changed "readers_readingcount" to
"readers_reading count"

(88): 3 more changes from "rwdrp" to "rdwrp"
{94}: 3-18: changed line 3 to read:

extern int

and added a line before the final }:

return 0;

{96}: 3-20: added a new first line:

extern int

and added a line before the final }:

return 0;

(101): 3-23: in 2nd comment: changed "th" to "the"

{103}: line 1 of 3-25: added "int" to beginning of line; 9th line from
bottom: changed "9781565921153_cond_signal" to "pthread_cond_broadcast"

{104}: 3-26: 12: changed line to read "return 0;"
{105}: 3-26: added line before final }:

return 0;

{106}: 3-28: added new 1st line:

extern int

{107}: 3-28: deleted line 2; also added line before final }:

return 0;

{113}: added new first line to 4-2:

#ifdef _POSIX_THREAD_ATTR_STACKSIZE

3 lines below that: changed "If" to "if"; added a final line:

#endif

{115}: added these lines after line 1 of 4-5:

.
9781565921153_attr_init (&custom_attr);
.

{120}: added the start of 2nd line of 4-10: "int"
{121}: also added "int" to start of lines 3 and 13
{123}: changed line 3 of 4-11 to read:

int init_comm(void)

and line -4 to read:

void free_conn(int *connp)

{124}: added "int" to start of 1st line of 4-12
{126}: added "int" to start of lines 1 and 13 of 4-13
{131}: added the following lines to beginning of 4-14:

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys.types.h>
#include <9781565921153.h>

line added before "main()":

extern int

and: changed "main()" to "main(void)"

{132}: line -7 0f 4-14: changed the "I" near the end of the line to
"i"; changed blank line -3 to "}" aligned above "printf"; added a line
below "printf...":

return 0;

{133}: line -5 of 4-15: lowercased the "I"

{134}: 4-16: line 9: changed "type" to "state"; in line 10, changed
"state" to "type"; 6th line from end of example: added "%d" before
"\n"

{152}: added semicolons to the end of lines 10 and 11 of code
{155}: added new 1st line to 4-26:

extern int

and: changed "server main()" to "main(void)"

{156}: added next-to-last line to 4-26:

return 0;

{159}: added line to replace middle dot in 4-27:

high_prio = sched_get_priority_max(SCHED_FIFO);

{160}: added sentence after parenthetical in para. 1:

The priority passed is an integer argument set up in the same manner
as a thread's priority value.

{162}: at end of example: added these lines:

	.
	.
	.
  }

{172}: 5-1: line added before "main()":

extern int

and: changed "main()" to "main(void)"

{173}: added "void *" to start of line 1 of 5-2; also indented the
lines from "sigwait..." to "9781565921153_mutex_unlock..."; added a new
next-to-last line:

return NULL;

(174): indented the last 3 lines on the page

{175}: 5-4: put "void *arg" in the parens in line 1; added a
next-to-last line:

return (NULL);

{177}: added "void" to start of line 2 of 5-5; indented lines 8, 12,
and 17; in line 14, changed "[j+l]" to "[j]"

{178}: added "void" to start of line 1 of 5-6; indented lines 8 and 12

{184}: 5-8: added a final line: a "}" aligned with the "{" in line 2;
also, in the next-to-last text para., changed both instances of
"9781565921153_test_cancel" to "pthread_testcancel"

{216}: added "void" to start of line 3 of both example 6-4 and 6-5

{217}: ditto for example 6-6; also in 6-6, lowercased the "I" in line
10

{218}: ditto for example 6-7; lowercased the "I" in line 9

{238-239}: for all of example A-1, when there's a word with "*" in
front on a line by itself, moved that back to align with the other
"*"s above.  The same goes for "estring[20];" on p. 238; also, on 239,
in A-2: changed blank line 4 to:

extern int

{240}: A-2: next-to-last line was "}", is now:

return 0;

(247): line 2: changed "9781565921153_attr_getschedcalls" to
"9781565921153_attr_getsched calls"

(248): under "Process-Blocking Calls": changed "tcdrainas" to "tcdrain
as"

(269): added the following to the next-to-last para.:

Whenever possible, our books use RepKover (tm), a durable and flexible
lay-flat binding. If the page count exceeds RepKover's limit, perfect
binding is used.