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// SV_Semaphore_Simple.cpp
// $Id$
/* -*- C++ -*- */
#define ACE_BUILD_DLL
#include "ace/SV_Semaphore_Simple.h"
ACE_ALLOC_HOOK_DEFINE(ACE_SV_Semaphore_Simple)
void
ACE_SV_Semaphore_Simple::dump (void) const
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::dump");
}
int
ACE_SV_Semaphore_Simple::control (int cmd,
int value,
u_short semnum) const
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::control");
if (this->internal_id_ == -1)
return -1;
else
{
semun semctl_arg;
semctl_arg.val = value;
return ACE_OS::semctl (this->internal_id_,
semnum,
cmd,
semctl_arg);
}
}
int
ACE_SV_Semaphore_Simple::init (key_t k, int i)
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::init");
this->key_ = k;
this->internal_id_ = i;
return 0;
}
// General ACE_SV_Semaphore operation. Increment or decrement by a
// specific amount (positive or negative; amount can`t be zero).
int
ACE_SV_Semaphore_Simple::op (int val, u_short n, int flags) const
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::op");
sembuf op_op;
op_op.sem_num = n;
op_op.sem_flg = flags;
if (this->internal_id_ == -1)
return -1;
else if ((op_op.sem_op = val) == 0)
return -1;
else
return ACE_OS::semop (this->internal_id_, &op_op, 1);
}
// Open or create one or more SV_Semaphores. We return 0 if all is
// OK, else -1.
int
ACE_SV_Semaphore_Simple::open (key_t k,
int flags,
int initial_value,
u_short n,
int perms)
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::open");
union semun ivalue;
if (k == IPC_PRIVATE || k == ACE_INVALID_SEM_KEY)
return -1;
ivalue.val = initial_value;
this->key_ = k;
this->sem_number_ = n;
this->internal_id_ = ACE_OS::semget (this->key_, n, perms | flags);
if (this->internal_id_ == -1)
return -1;
if (ACE_BIT_ENABLED (flags, IPC_CREAT))
for (int i = 0; i < n; i++)
if (ACE_OS::semctl (this->internal_id_, i, SETVAL, ivalue) == -1)
return -1;
return 0;
}
ACE_SV_Semaphore_Simple::ACE_SV_Semaphore_Simple (key_t k,
int flags,
int initial_value,
u_short n,
int perms)
: key_ (k)
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::ACE_SV_Semaphore_Simple");
if (this->open (k, flags, initial_value, n, perms) == -1)
ACE_ERROR ((LM_ERROR, "%p\n", "ACE_SV_Semaphore::ACE_SV_Semaphore"));
}
// Convert name to key. This function is used internally to create keys
// for the semaphores.
//
// The method for generating names is a 32 bit CRC, but still we
// measured close to collition ratio of nearly 0.1% for
// ACE::unique_name()-like strings.
key_t
ACE_SV_Semaphore_Simple::name_2_key (const char *name)
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::name_2_key");
if (name == 0)
{
errno = EINVAL;
return ACE_INVALID_SEM_KEY;
}
// Basically "hash" the values in the <name>. This won't
// necessarily guarantee uniqueness of all keys.
// But (IMHO) CRC32 is good enough for most purposes (Carlos)
return (key_t) ACE::crc32 (name);
}
// Open or create a ACE_SV_Semaphore. We return 1 if all is OK, else
// 0.
int
ACE_SV_Semaphore_Simple::open (const char *name,
int flags,
int initial_value,
u_short n,
int perms)
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::open");
key_t key;
if (name == 0)
key = ACE_DEFAULT_SEM_KEY;
else
key = this->name_2_key (name);
return this->open (key, flags, initial_value, n, perms);
}
ACE_SV_Semaphore_Simple::ACE_SV_Semaphore_Simple (const char *name,
int flags,
int initial_value,
u_short n,
int perms)
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::ACE_SV_Semaphore_Simple");
if (this->open (name, flags, initial_value, n, perms) == -1)
ACE_ERROR ((LM_ERROR, "%p\n",
"ACE_SV_Semaphore_Simple::ACE_SV_Semaphore_Simple"));
}
ACE_SV_Semaphore_Simple::~ACE_SV_Semaphore_Simple (void)
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::~ACE_SV_Semaphore_Simple");
this->close ();
}
ACE_SV_Semaphore_Simple::ACE_SV_Semaphore_Simple (void)
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::ACE_SV_Semaphore_Simple");
this->init ();
}
// Remove all SV_Semaphores associated with a particular key. This
// call is intended to be called from a server, for example, when it
// is being shut down, as we do an IPC_RMID on the ACE_SV_Semaphore,
// regardless of whether other processes may be using it or not. Most
// other processes should use close() below.
int
ACE_SV_Semaphore_Simple::remove (void) const
{
ACE_TRACE ("ACE_SV_Semaphore_Simple::remove");
int result = this->control (IPC_RMID);
((ACE_SV_Semaphore_Simple *) this)->init ();
return result;
}
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