v/vlib/live/common.v

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module live
pub const (
is_used = 1
)
pub type FNLinkLiveSymbols = fn (linkcb voidptr)
pub type FNLiveReloadCB = fn (info &LiveReloadInfo)
pub struct LiveReloadInfo {
pub:
vexe string // full path to the v compiler
vopts string // v compiler options for a live shared library
original string // full path to the original source file, compiled with -live
live_fn_mutex voidptr // the address of the C mutex, that locks the [live] fns during reloads.
live_linkfn FNLinkLiveSymbols // generated C callback; receives a dlopen handle
so_extension string // .so or .dll
so_name_template string // a sprintf template for the shared libraries location
pub mut:
live_lib voidptr // the result of dl.open
reloads int // how many times a reloading was tried
reloads_ok int // how many times the reloads succeeded
reload_time_ms int // how much time the last reload took (compilation + loading)
last_mod_ts int // a timestamp for when the original was last changed
recheck_period_ms int = 100 // how often do you want to check for changes
cb_recheck FNLiveReloadCB = voidptr(0) // executed periodically
cb_compile_failed FNLiveReloadCB = voidptr(0) // executed when a reload compilation failed
cb_before FNLiveReloadCB = voidptr(0) // executed before a reload try happens
cb_after FNLiveReloadCB = voidptr(0) // executed after a reload try happened, even if failed
cb_locked_before FNLiveReloadCB = voidptr(0) // executed before lib reload, in the mutex section
cb_locked_after FNLiveReloadCB = voidptr(0) // executed after lib reload, in the mutex section
user_ptr voidptr = voidptr(0) // you can set it to anything, then retrieve it in the cb_ fns
}
// LiveReloadInfo.live_linkfn should be called by the reloader
// to dlsym all live functions. TODO: research a way to implement
// live_linkfn in pure V, without complicating live code generation
// too much.
//
// The callbacks: cb_compile_fail, cb_before, cb_after will be
// executed outside the mutex protected section, so be careful,
// if you modify your data inside them. They can race with your
// [live] functions.
//
// cb_locked_before and cb_locked_after will be executed *inside*
// the mutex protected section. They can NOT race with your [live]
// functions. They should be very quick in what they do though,
// otherwise your live functions can be delayed.
//
// live.info - give user access to program's LiveReloadInfo struct,
// so that the user can set callbacks, read meta information, etc.
pub fn info() &LiveReloadInfo {
if C.g_live_info != 0 {
return &LiveReloadInfo(C.g_live_info)
}
// When the current program is not compiled with -live, simply
// return a new empty struct LiveReloadInfo in order to prevent
// crashes. In this case, the background reloader thread is not
// started, and the structure LiveReloadInfo will not get updated.
// All its fields will be 0, but still safe to access.
mut x := &LiveReloadInfo{}
unsafe {
mut p := &u64(&C.g_live_info)
*p = &u64(x)
}
return x
}