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/* mqueue_types.h: internal POSIX message queue types
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#pragma once
#define MQI_MAGIC 0x98765432UL
/* The mq_attr structure is defined using long datatypes per POSIX.
The mq_fattr is the in-file representation of the mq_attr struct.
Originally created this way for 32/64 bit interoperability, this
is of no concern anymore. */
#pragma pack (push, 4)
struct mq_fattr
{
uint32_t mq_flags;
uint32_t mq_maxmsg;
uint32_t mq_msgsize;
uint32_t mq_curmsgs;
};
struct mq_hdr
{
struct mq_fattr mqh_attr; /* the queue's attributes */
int32_t mqh_head; /* index of first message */
int32_t mqh_free; /* index of first free message */
int32_t mqh_nwait; /* #threads blocked in mq_receive() */
pid_t mqh_pid; /* nonzero PID if mqh_event set */
uint32_t __mqh_ext[36]; /* free for extensions */
union {
struct sigevent mqh_event; /* for mq_notify() */
uint64_t __mqh_dummy[4];
};
uint64_t __mqh_ext2[4]; /* free for extensions */
uint32_t mqh_magic; /* Expect MQI_MAGIC here, otherwise it's
an old-style message queue. */
};
struct msg_hdr
{
int32_t msg_next; /* index of next on linked list */
int32_t msg_len; /* actual length */
unsigned int msg_prio; /* priority */
};
#pragma pack (pop)
struct mq_info
{
struct mq_hdr *mqi_hdr; /* start of mmap'ed region */
HANDLE mqi_sect; /* file mapping section handle */
SIZE_T mqi_sectsize; /* file mapping section size */
mode_t mqi_mode; /* st_mode of the mapped file */
HANDLE mqi_lock; /* mutex lock */
HANDLE mqi_waitsend; /* and condition variable for full queue */
HANDLE mqi_waitrecv; /* and condition variable for empty queue */
uint32_t mqi_magic; /* magic number if open */
};
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