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U:RDoc::AnyMethod[iI"
flock:ETI"File#flock;TF: publico:RDoc::Markup::Document: @parts[ o: RDoc::Markup::Paragraph; [I"Locks or unlocks file +self+ according to the given locking_constant,
a bitwise OR of the values in the table below.;To;
; [I"$Not available on all platforms.;To;
; [I"Returns false if File::LOCK_NB is specified and the operation would have blocked;
otherwise returns 0.;To:RDoc::Markup::Table: @header[I"
Constant;TI" Lock;TI" Effect;T: @align[000:
@body[ [I"+File::LOCK_EX+;TI"Exclusive;TI"FOnly one process may hold an exclusive lock for +self+ at a time.;T[I"+File::LOCK_NB+;TI"Non-blocking;TI"sNo blocking; may be combined with +File::LOCK_SH+ or +File::LOCK_EX+ using the bitwise OR operator |.;T[I"+File::LOCK_SH+;TI" Shared;TI"PMultiple processes may each hold a shared lock for +self+ at the same time.;T[I"+File::LOCK_UN+;TI" Unlock;TI"2Remove an existing lock held by this process.;To;
; [I"
Example:;To:RDoc::Markup::Verbatim; [I"# Update a counter using an exclusive lock.
# Don't use File::WRONLY because it truncates the file.
File.open('counter', File::RDWR | File::CREAT, 0644) do |f|
f.flock(File::LOCK_EX)
value = f.read.to_i + 1
f.rewind
f.write("#{value}\n")
f.flush
f.truncate(f.pos)
end
# Read the counter using a shared lock.
File.open('counter', 'r') do |f|
f.flock(File::LOCK_SH)
f.read
end
;T: @format: ruby:
@fileI" file.c;T:0@omit_headings_from_table_of_contents_below0I"+flock(locking_constant) -> 0 or false
;T0[ I" (p1);T@1FI" File;TcRDoc::NormalClass00