diff options
Diffstat (limited to 'winsup/cygwin/local_includes/mqueue_types.h')
| -rw-r--r-- | winsup/cygwin/local_includes/mqueue_types.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/winsup/cygwin/local_includes/mqueue_types.h b/winsup/cygwin/local_includes/mqueue_types.h new file mode 100644 index 000000000..1e4fe127e --- /dev/null +++ b/winsup/cygwin/local_includes/mqueue_types.h @@ -0,0 +1,66 @@ +/* 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 + +#define MQ_PATH "/dev/mqueue/" +#define MQ_LEN (sizeof (MQ_PATH) - 1) + +/* 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 */ +}; + + |