Remove no-longer-used libpsem and related code and tests.

This commit is contained in:
Patrick Mahoney 2012-02-01 21:42:34 -06:00
parent 8158666e90
commit 842ff179ec
21 changed files with 0 additions and 936 deletions

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@ -6,10 +6,6 @@ def gemspec
@gemspec ||= eval(File.read('process_shared.gemspec'), binding, 'process_shared.gemspec') @gemspec ||= eval(File.read('process_shared.gemspec'), binding, 'process_shared.gemspec')
end end
Rake::ExtensionTask.new('libpsem') do |ext|
ext.lib_dir = 'lib/process_shared'
end
Rake::ExtensionTask.new('helper') do |ext| Rake::ExtensionTask.new('helper') do |ext|
ext.lib_dir = 'lib/process_shared/posix' ext.lib_dir = 'lib/process_shared/posix'
end end

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@ -1,188 +0,0 @@
/*
* Extensions atop psem. Recursive mutex, bounded semaphore.
*/
#include <stdlib.h> /* malloc, free */
#include "mempcpy.h" /* includes string.h */
#include "psem.h"
#include "psem_error.h"
#include "bsem.h"
#define MAX_NAME 128 /* This is much less the POSIX max
name. Users of this library must
not use longer names. */
static const char bsem_lock_suffix[] = "-bsem-lock";
#define MAX_LOCK_NAME (MAX_NAME + strlen(bsem_lock_suffix) + 1)
/**
* Assumes dest has sufficient space to hold "[MAX_NAME]-bsem-lock".
*/
static int
make_lockname(char *dest, const char *name, error_t **err)
{
int namelen;
namelen = strlen(name);
if (namelen > MAX_NAME) {
error_new(err, E_SOURCE_PSEM, E_NAME_TOO_LONG);
return ERROR;
}
*((char *) mempcpy(mempcpy(dest, name, namelen),
bsem_lock_suffix,
strlen(bsem_lock_suffix))) = '\0';
}
size_t sizeof_bsem_t = sizeof (bsem_t);
bsem_t *
bsem_alloc(void) {
return malloc(sizeof(bsem_t));
}
void
bsem_free(bsem_t *bsem) {
free(bsem);
}
#define call_or_return(exp) \
do { if ((exp) == ERROR) { return ERROR; } } while (0)
#define bsem_lock_or_return(bsem, err) call_or_return(bsem_lock((bsem), (err)))
#define bsem_unlock_or_return(bsem, err) call_or_return(bsem_unlock((bsem), (err)))
int
bsem_open(bsem_t *bsem, const char *name, unsigned int maxvalue, unsigned int value, error_t **err)
{
char lockname[MAX_LOCK_NAME];
call_or_return(psem_open(&bsem->psem, name, value, err));
call_or_return(make_lockname(lockname, name, err));
call_or_return(psem_open(&bsem->lock, lockname, 1, err));
bsem->maxvalue = maxvalue;
return OK;
}
static int
bsem_lock(bsem_t *bsem, error_t **err)
{
call_or_return(psem_wait(&bsem->lock, err));
return OK;
}
static int
bsem_unlock(bsem_t *bsem, error_t **err)
{
call_or_return(psem_post(&bsem->lock, err));
return OK;
}
int
bsem_close(bsem_t *bsem, error_t **err)
{
bsem_lock_or_return(bsem, err);
if (psem_close(&bsem->psem, err) == ERROR) {
bsem_unlock(bsem, NULL);
return ERROR;
}
bsem_unlock_or_return(bsem, err);
call_or_return(psem_close(&bsem->lock, err));
return OK;
}
int
bsem_unlink(const char *name, error_t **err)
{
char lockname[MAX_LOCK_NAME];
call_or_return(psem_unlink(name, err));
call_or_return(make_lockname(lockname, name, err));
call_or_return(psem_unlink(lockname, err));
return OK;
}
int
bsem_post(bsem_t *bsem, error_t **err)
{
int sval;
bsem_lock_or_return(bsem, err);
/* FIXME: maxvalue is broken on some systems... (cygwin? mac?) */
if (psem_getvalue(&bsem->psem, &sval, err) == ERROR) {
bsem_unlock(bsem, err);
return ERROR;
}
if (sval >= bsem->maxvalue) {
/* ignored silently */
bsem_unlock(bsem, err);
return OK;
}
if (psem_post(&bsem->psem, err) == ERROR) {
bsem_unlock(bsem, err);
return ERROR;
}
bsem_unlock_or_return(bsem, err);
return OK;
}
int
bsem_wait(bsem_t *bsem, error_t **err)
{
call_or_return(psem_wait(&bsem->psem, err));
return OK;
}
int
bsem_trywait(bsem_t *bsem, error_t **err)
{
bsem_lock_or_return(bsem, err);
if (psem_trywait(&bsem->psem, err) == ERROR) {
bsem_unlock(bsem, NULL);
return ERROR;
}
bsem_unlock_or_return(bsem, err);
return OK;
}
int
bsem_timedwait(bsem_t *bsem, float timeout_s, error_t **err)
{
bsem_lock_or_return(bsem, err);
if (psem_timedwait(&bsem->psem, timeout_s, err) == ERROR) {
bsem_unlock(bsem, NULL);
return ERROR;
}
bsem_unlock_or_return(bsem, err);
return OK;
}
int
bsem_getvalue(bsem_t *bsem, int *sval, error_t **err)
{
bsem_lock_or_return(bsem, err);
if (psem_getvalue(&bsem->psem, sval, err) == ERROR) {
bsem_unlock(bsem, NULL);
return ERROR;
}
bsem_unlock_or_return(bsem, err);
return OK;
}

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@ -1,32 +0,0 @@
#ifndef __BSEM_H__
#define __BSEM_H__
#include "psem.h"
#include "psem_error.h"
struct bsem {
psem_t psem;
psem_t lock;
int maxvalue;
};
typedef struct bsem bsem_t;
extern size_t sizeof_bsem_t;
bsem_t * bsem_alloc();
void bsem_free(bsem_t *bsem);
int bsem_open(bsem_t *, const char *, unsigned int, unsigned int, error_t **);
int bsem_close(bsem_t *, error_t **);
int bsem_unlink(const char *, error_t **);
int bsem_post(bsem_t *, error_t **);
int bsem_wait(bsem_t *, error_t **);
int bsem_trywait(bsem_t *, error_t **);
int bsem_timedwait(bsem_t *, float, error_t **);
int bsem_getvalue(bsem_t *, int *, error_t **);
#endif /* __BSEM_H__ */

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@ -1,22 +0,0 @@
/**
* Define and extern various constants defined as macros.
*/
#include <sys/mman.h> /* PROT_*, MAP_* */
#include <fcntl.h> /* O_* */
#include "constants.h"
int o_rdwr = O_RDWR;
int o_creat = O_CREAT;
int o_excl = O_EXCL;
int prot_read = PROT_READ;
int prot_write = PROT_WRITE;
int prot_exec = PROT_EXEC;
int prot_none = PROT_NONE;
void * map_failed = MAP_FAILED;
int map_shared = MAP_SHARED;
int map_private = MAP_PRIVATE;

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@ -1,18 +0,0 @@
#ifndef __CONSTANTS_H__
#define __CONSTANTS_H__
extern int o_rdwr;
extern int o_creat;
extern int o_excl;
extern int prot_read;
extern int prot_write;
extern int prot_exec;
extern int prot_none;
extern void * map_failed;
extern int map_shared;
extern int map_private;
#endif

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@ -1,40 +0,0 @@
require 'mkmf'
$objs = []
# posix semaphores
if have_func('sem_open', 'semaphore.h') ||
($libs << '-lpthread' && have_func('sem_open', 'semaphore.h'))
have_func('floorf', 'math.h') or abort("Missing required floorf() in math.h")
have_library('m', 'floorf')
unless have_func('mempcpy', 'string.h')
$objs << 'mempcpy.o'
end
have_library('rt', 'sem_open')
else
abort('Win32 or platform without sem_open not supported (yet?)')
end
c_sources = ['psem.c', 'psem_error.c', 'psem_posix.c', 'bsem.c', 'constants.c']
$objs += ['psem.o', 'psem_error.o', 'bsem.o', 'constants.o']
if respond_to? :depend_rules
depend_rules <<-END
psem.c: psem.h psem_posix.c
psem_error.c: psem_error.h
bsem.h: psem.h psem_error.h
bsem.c: psem.h psem_error.h bsem.h
constants.c: constants.h
mempcpy.c: mempcpy.h
#{$objs.map { |o| "#{o}: #{o.chomp(".o")}.c" }.join("\n")}
libpsem.o: #{$objs.join(' ')}
END
end
create_makefile('libpsem')

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@ -1,7 +0,0 @@
#include "mempcpy.h"
void *
mempcpy(void *dest, const void *src, size_t n)
{
return (char *) memcpy(dest, src, n) + n;
}

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@ -1,13 +0,0 @@
#ifndef __MEMPCPY_H__
#define __MEMPCPY_H__
#ifdef HAVE_MEMPCPY
#define __USE_GNU
#else
#include <stdlib.h>
void *mempcpy(void *, const void *, size_t);
#endif
#include <string.h>
#endif /* __MEMPCPY_H__ */

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@ -1,15 +0,0 @@
#include <stdlib.h> /* malloc, free */
#include "mutex.h"
size_t sizeof_mutex_t = sizeof (mutex_t);
mutex_t *
mutex_alloc(void) {
return malloc(sizeof(mutex_t));
}
void
mutex_free(mutex_t * mutex) {
free(mutex);
}

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@ -1,14 +0,0 @@
#ifndef __MUTEX_H__
#define __MUTEX_H__
#include "bsem.h"
struct mutex {
bsem_t *bsem;
};
typedef struct mutex mutex_t;
extern size_t sizeof_mutex_t;
#endif /* __MUTEX_H__ */

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@ -1,15 +0,0 @@
#include "psem.h"
int OK = 0;
int ERROR = -1;
int E_SOURCE_SYSTEM = 1;
int E_SOURCE_PSEM = 2;
int E_NAME_TOO_LONG = 1;
#ifdef HAVE_SEM_OPEN
#include "psem_posix.c"
#endif
size_t sizeof_psem_t = sizeof (psem_t);

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@ -1,45 +0,0 @@
#ifndef __PSEM_H__
#define __PSEM_H__
/**
* Portable semaphore interface focusing on cross-process use.
*/
#include <stdlib.h> /* size_t */
#ifdef HAVE_SEM_OPEN
#include "psem_posix.h"
#endif
#include "psem_error.h"
typedef struct psem psem_t;
extern size_t sizeof_psem_t;
extern int OK;
extern int ERROR;
extern int E_SOURCE_SYSTEM;
extern int E_SOURCE_PSEM;
extern int E_NAME_TOO_LONG;
int psem_errno();
psem_t * psem_alloc();
void psem_free(psem_t *);
int psem_open(psem_t *, const char *, unsigned int, error_t **);
int psem_close(psem_t *, error_t **);
int psem_unlink(const char *, error_t **);
int psem_post(psem_t *, error_t **);
int psem_wait(psem_t *, error_t **);
int psem_trywait(psem_t *, error_t **);
int psem_timedwait(psem_t *, float, error_t **);
int psem_getvalue(psem_t *, int *, error_t **);
#endif /* __PSEM_H__ */

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@ -1,46 +0,0 @@
/**
* Similar to GError from GLib.
*/
#include <stdlib.h> /* malloc, free */
#include "psem_error.h"
struct error {
int error_source;
int error_number;
};
error_t *
error_alloc()
{
return (error_t *) malloc(sizeof (error_t));
}
void
error_free(error_t *err)
{
free(err);
}
void
error_set(error_t *err, int source, int value)
{
err->error_source = source;
err->error_number = value;
}
void
error_new(error_t **err, int source, int value)
{
if (err != NULL) {
if (*err == NULL) {
*err = error_alloc();
error_set(*err, source, value);
} else {
/* tried to create a new error atop an existing error... */
}
} else {
/* error is being ignored by caller */
}
}

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@ -1,11 +0,0 @@
#ifndef __PSEM_ERROR_H__
#define __PSEM_ERROR_H__
typedef struct error error_t;
error_t * error_alloc();
void error_free(error_t *);
void error_set(error_t *, int, int);
#endif /* __PSEM_ERROR_H__ */

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@ -1,160 +0,0 @@
/*
* A type which wraps a semaphore
*
* semaphore.c
*
* Copyright (c) 2006-2008, R Oudkerk
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the name of author nor the names of any contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Modifications Copyright (c) 2011, Patrick Mahoney
*/
#include <errno.h>
#include <fcntl.h> /* For O_* constants */
#include <sys/stat.h> /* For mode constants */
#include <semaphore.h>
#include <stdlib.h> /* malloc, free */
#include <math.h> /* floorf */
#include <time.h> /* timespec */
#include "psem.h"
#include "psem_posix.h"
psem_t *
psem_alloc(void) {
return (psem_t *) malloc(sizeof(psem_t));
}
void
psem_free(psem_t *psem) {
free(psem);
}
#define errcheck_val(expr, errval, err) \
do { \
if ((expr) == (errval)) { \
error_new((err), E_SOURCE_SYSTEM, errno); \
return ERROR; \
} \
} while (0)
#define errcheck(expr, err) errcheck_val((expr), -1, (err))
int
psem_open(psem_t *psem, const char *name, unsigned int value, error_t **err)
{
errcheck_val(psem->sem = sem_open(name, O_CREAT | O_EXCL, 0600, value),
SEM_FAILED,
err);
return OK;
}
int
psem_close(psem_t *psem, error_t **err)
{
errcheck(sem_close(psem->sem), err);
return OK;
}
int
psem_unlink(const char *name, error_t **err)
{
errcheck(sem_unlink(name), err);
return OK;
}
int
psem_post(psem_t *psem, error_t **err)
{
errcheck(sem_post(psem->sem), err);
return OK;
}
int
psem_wait(psem_t *psem, error_t **err)
{
errcheck(sem_wait(psem->sem), err);
return OK;
}
int
psem_trywait(psem_t *psem, error_t **err)
{
errcheck(sem_trywait(psem->sem), err);
return OK;
}
#define NS_PER_S (1000 * 1000 * 1000)
#define US_PER_NS (1000)
#define TV_NSEC_MAX (NS_PER_S - 1)
int
psem_timedwait(psem_t *psem, float timeout_s, error_t **err)
{
struct timeval now;
struct timespec abs_timeout;
errcheck(gettimeofday(&now, NULL), err);
abs_timeout.tv_sec = now.tv_sec;
abs_timeout.tv_nsec = now.tv_usec * US_PER_NS;
/* Fun with rounding: careful adding reltive timeout to abs time */
{
time_t sec; /* relative timeout */
long nsec;
sec = floorf(timeout_s);
nsec = floorf((timeout_s - floorf(timeout_s)) * NS_PER_S);
abs_timeout.tv_sec += sec;
abs_timeout.tv_nsec += nsec;
while (abs_timeout.tv_nsec > TV_NSEC_MAX) {
abs_timeout.tv_sec += 1;
abs_timeout.tv_nsec -= NS_PER_S;
}
}
errcheck(sem_timedwait(psem->sem, &abs_timeout), err);
return OK;
}
int
psem_getvalue(psem_t *psem, int *sval, error_t **err)
{
errcheck(sem_getvalue(psem->sem, sval), err);
return OK;
}

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@ -1,10 +0,0 @@
#ifndef __PSEM_POSIX_H__
#define __PSEM_POSIX_H__
#include <semaphore.h>
struct psem {
sem_t *sem;
};
#endif /* __PSEM_POSIX_H__ */

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@ -1,36 +0,0 @@
require 'ffi'
require 'process_shared/posix_call'
require 'process_shared/psem'
module ProcessShared
module LibC
extend FFI::Library
extend PosixCall
ffi_lib FFI::Library::LIBC
MAP_FAILED = FFI::Pointer.new(-1)
MAP_SHARED = PSem.map_shared
MAP_PRIVATE = PSem.map_private
PROT_READ = PSem.prot_read
PROT_WRITE = PSem.prot_write
PROT_EXEC = PSem.prot_exec
PROT_NONE = PSem.prot_none
O_RDWR = PSem.o_rdwr
O_CREAT = PSem.o_creat
O_EXCL = PSem.o_excl
attach_variable :errno, :int
attach_function :mmap, [:pointer, :size_t, :int, :int, :int, :off_t], :pointer
attach_function :munmap, [:pointer, :size_t], :int
attach_function :ftruncate, [:int, :off_t], :int
attach_function :close, [:int], :int
error_check(:mmap) { |v| v == MAP_FAILED }
error_check(:munmap, :ftruncate, :close)
end
end

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@ -1,113 +0,0 @@
require 'ffi'
module ProcessShared
module PSem
class Error < FFI::Struct
layout(:source, :int,
:errno, :int)
end
extend FFI::Library
# Workaround FFI dylib/bundle issue. See https://github.com/ffi/ffi/issues/42
suffix = if FFI::Platform.mac?
'bundle'
else
FFI::Platform::LIBSUFFIX
end
ffi_lib File.join(File.expand_path(File.dirname(__FILE__)),
'libpsem.' + suffix)
class << self
# Replace methods in `syms` with error checking wrappers that
# invoke the original psem method and raise an appropriate
# error.
#
# The last argument is assumed to be a pointer to a pointer
# where either a psem error or NULL will be stored.
def psem_error_check(*syms)
syms.each do |sym|
method = self.method(sym)
block = lambda do |*args|
if method.call(*args) < 0
errp = args[-1]
unless errp.nil?
begin
err = Error.new(errp.read_pointer)
errp.write_pointer(nil)
if err[:source] == PSem.e_source_system
raise SystemCallError.new("error in #{sym}", err[:errno])
else
raise "error in #{sym}: #{err.get_integer(1)}"
end
ensure
psem_error_free(err)
end
end
end
end
define_method(sym, &block)
define_singleton_method(sym, &block)
end
end
end
# Generic constants
int_consts = [:o_rdwr,
:o_creat,
:o_excl,
:prot_read,
:prot_write,
:prot_exec,
:prot_none,
:map_shared,
:map_private]
int_consts.each { |sym| attach_variable sym, :int }
# Other constants, functions
attach_function :psem_error_free, :error_free, [:pointer], :void
attach_variable :e_source_system, :E_SOURCE_SYSTEM, :int
attach_variable :e_source_psem, :E_SOURCE_PSEM, :int
attach_variable :e_name_too_long, :E_NAME_TOO_LONG, :int
attach_variable :sizeof_psem_t, :size_t
attach_variable :sizeof_bsem_t, :size_t
# PSem functions
attach_function :psem_open, [:pointer, :string, :uint, :pointer], :int
attach_function :psem_close, [:pointer, :pointer], :int
attach_function :psem_unlink, [:string, :pointer], :int
attach_function :psem_post, [:pointer, :pointer], :int
attach_function :psem_wait, [:pointer, :pointer], :int
attach_function :psem_trywait, [:pointer, :pointer], :int
attach_function :psem_timedwait, [:pointer, :float, :pointer], :int
attach_function :psem_getvalue, [:pointer, :pointer, :pointer], :int
psem_error_check(:psem_open, :psem_close, :psem_unlink, :psem_post,
:psem_wait, :psem_trywait, :psem_timedwait, :psem_getvalue)
# BSem functions
attach_function :bsem_open, [:pointer, :string, :uint, :uint, :pointer], :int
attach_function :bsem_close, [:pointer, :pointer], :int
attach_function :bsem_unlink, [:string, :pointer], :int
attach_function :bsem_post, [:pointer, :pointer], :int
attach_function :bsem_wait, [:pointer, :pointer], :int
attach_function :bsem_trywait, [:pointer, :pointer], :int
attach_function :bsem_timedwait, [:pointer, :float, :pointer], :int
attach_function :bsem_getvalue, [:pointer, :pointer, :pointer], :int
psem_error_check(:bsem_open, :bsem_close, :bsem_unlink, :bsem_post,
:bsem_wait, :bsem_trywait, :bsem_timedwait, :bsem_getvalue)
end
end

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@ -1,5 +1,3 @@
require 'process_shared/rt'
require 'process_shared/libc'
require 'process_shared/with_self' require 'process_shared/with_self'
require 'process_shared/shared_memory_io' require 'process_shared/shared_memory_io'

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@ -1,9 +0,0 @@
require 'process_shared/libc'
module ProcessShared
describe LibC do
it 'throws exceptions with invalid args' do
proc { LibC.mmap nil,2,0,0,1,0 }.must_raise(Errno::EINVAL)
end
end
end

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@ -1,136 +0,0 @@
require 'spec_helper'
require 'process_shared/psem'
module ProcessShared
describe PSem do
before do
extend PSem
end
before(:each) do
@err = FFI::MemoryPointer.new(:pointer)
end
describe '.psem_open' do
it 'opens a psem' do
psem = FFI::MemoryPointer.new(PSem.sizeof_psem_t)
psem_open(psem, "psem-test", 1, @err)
psem_unlink("psem-test", @err)
end
it 'raises excpetion if name alredy exists' do
psem1 = FFI::MemoryPointer.new(PSem.sizeof_psem_t)
psem2 = FFI::MemoryPointer.new(PSem.sizeof_psem_t)
psem_open(psem1, "psem-test", 1, @err)
proc { psem_open(psem2, "psem-test", 1, @err) }.must_raise(Errno::EEXIST)
psem_unlink("psem-test", @err)
psem_open(psem2, "psem-test", 1, @err)
psem_unlink("psem-test", @err)
end
end
describe '.psem_wait' do
before(:each) do
@psem = FFI::MemoryPointer.new(PSem.sizeof_psem_t)
psem_open(@psem, 'psem-test', 1, @err)
psem_unlink('psem-test', @err)
@int = FFI::MemoryPointer.new(:int)
end
after(:each) do
#psem_close(@psem, @err)
end
def value
psem_getvalue(@psem, @int, @err)
@int.get_int(0)
end
it 'decrements psem value' do
value.must_equal 1
psem_wait(@psem, @err)
value.must_equal(0)
end
it 'waits until another process posts' do
psem_wait(@psem, @err)
# child exits with ~ time spent waiting
child = fork do
start = Time.now
psem_wait(@psem, @err)
exit (Time.now - start).ceil
end
t = 1.5
sleep t
psem_post(@psem, @err)
_pid, status = Process.wait2(child)
status.exitstatus.must_equal 2
end
end
describe '.bsem_open' do
it 'opens a bsem' do
bsem = FFI::MemoryPointer.new(PSem.sizeof_bsem_t)
bsem_open(bsem, "bsem-test", 1, 1, @err)
bsem_unlink("bsem-test", @err)
end
it 'raises excpetion if name alredy exists' do
bsem1 = FFI::MemoryPointer.new(PSem.sizeof_bsem_t)
bsem2 = FFI::MemoryPointer.new(PSem.sizeof_bsem_t)
bsem_open(bsem1, "bsem-test", 1, 1, @err)
proc { bsem_open(bsem2, "bsem-test", 1, 1, @err) }.must_raise(Errno::EEXIST)
bsem_unlink("bsem-test", @err)
bsem_open(bsem2, "bsem-test", 1, 1, @err)
bsem_unlink("bsem-test", @err)
end
end
describe '.bsem_wait' do
before(:each) do
@bsem = FFI::MemoryPointer.new(PSem.sizeof_bsem_t)
bsem_open(@bsem, 'bsem-test', 1, 1, @err)
bsem_unlink('bsem-test', @err)
@int = FFI::MemoryPointer.new(:int)
end
after do
#bsem_close(@bsem, @err)
end
def value
bsem_getvalue(@bsem, @int, @err)
@int.get_int(0)
end
it 'decrements bsem value' do
value.must_equal 1
bsem_wait(@bsem, @err)
value.must_equal 0
end
it 'waits until another process posts' do
bsem_wait(@bsem, @err)
# child exits with ~ time spent waiting
child = fork do
start = Time.now
bsem_wait(@bsem, @err)
exit (Time.now - start).ceil
end
t = 1.5
sleep t
bsem_post(@bsem, @err)
_pid, status = Process.wait2(child)
status.exitstatus.must_equal 2
end
end
end
end