mg_broadcast.md 676 Bytes
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---
title: "mg_broadcast()"
decl_name: "mg_broadcast"
symbol_kind: "func"
signature: |
  void mg_broadcast(struct mg_mgr *, mg_event_handler_t func, void *, size_t);
---

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Passes a message of a given length to all connections.
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Must be called from a thread that does NOT call `mg_mgr_poll()`.
Note that `mg_broadcast()` is the only function
that can be, and must be, called from a different (non-IO) thread.

`func` callback function will be called by the IO thread for each
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connection. When called, the event will be `MG_EV_POLL`, and a message will
be passed as the `ev_data` pointer. Maximum message size is capped
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by `MG_CTL_MSG_MESSAGE_SIZE` which is set to 8192 bytes.