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