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core/msg_bus: clarify API of msg_bus_post()

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Receiving threads must not modify the contents of the message as this
is racy by definition.

Also make `msg_bus_post()` accept `const void*` instead of `char *`.
This commit is contained in:
Benjamin Valentin 2020-05-05 00:50:21 +02:00
parent f3dddd6127
commit c29f133a63
1 changed files with 3 additions and 2 deletions
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5
core/include/msg_bus.h
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@ -103,6 +103,7 @@ static inline bool msg_is_from_bus(const msg_bus_t *bus, const msg_t *msg)
* posted on the bus.
*
* Events can be received with @ref msg_receive.
* **The contents of the received message must not be modified.**
*
* @param[in] bus The message bus to attach to
* @param[in] entry Message bus subscriber entry
@ -194,13 +195,13 @@ int msg_send_bus(msg_t *m, msg_bus_t *bus);
*
* @return The number of threads the event was posted to.
*/
static inline int msg_bus_post(msg_bus_t *bus, uint8_t type, char *arg)
static inline int msg_bus_post(msg_bus_t *bus, uint8_t type, const void *arg)
{
assert(type < 32);
msg_t m = {
.type = type | ((bus->id) << 5),
.content.ptr = arg,
.content.ptr = (void *)arg,
};
return msg_send_bus(&m, bus);