_pulse

Description:

The _pulse structure describes a pulse, a fixed-size, nonblocking message that carries a small payload (four bytes of data plus a single byte code). The members include:

type

_PULSE_TYPE (0)

subtype

_PULSE_SUBTYPE (0)

code

A code that identifies the type of pulse. QNX OS reserves the negative codes (see below). You can define your own pulses, with a code in the range from _PULSE_CODE_MINAVAIL through _PULSE_CODE_MAXAVAIL.

value

Information that's relevant to the code. If you define your own pulses, you can decide what information you want to store in this field.

The value member is a sigval union defined as follows:

union sigval {
    int        sival_int;
    void     * sival_ptr;
    long       sival_long;
};

• int sival_int — an integer to be interpreted by the pulse handler.
• void *sival_ptr — a pointer to be interpreted by the pulse handler.
• long sival_long — a long integer to be interpreted by the pulse handler.

scoid

Server connection ID.

The codes that the OS reserves, and the values sent with the pulse, include the following:

For more details, see ChannelCreate().

Classification:

QNX OS