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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>
Class: Fiber
— Documentation by YARD 0.9.20
</title>
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<div id="header">
<div id="menu">
<a href="_index.html">Index (F)</a> »
<span class="title">Fiber</span>
</div>
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<a class="full_list_link" id="class_list_link"
href="class_list.html">
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<div class="clear"></div>
</div>
<div id="content"><h1>Class: Fiber
</h1>
<div class="box_info">
<dl>
<dt>Inherits:</dt>
<dd>
<span class="inheritName">Object</span>
<ul class="fullTree">
<li>Object</li>
<li class="next">Fiber</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
</dl>
<dl>
<dt>Defined in:</dt>
<dd>mrbgems/mruby-fiber/src/fiber.c</dd>
</dl>
</div>
<h2>
Instance Method Summary
<small><a href="#" class="summary_toggle">collapse</a></small>
</h2>
<ul class="summary">
<li class="public ">
<span class="summary_signature">
<a href="#==-instance_method" title="#== (instance method)">#<strong>==</strong> ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#alive%3F-instance_method" title="#alive? (instance method)">#<strong>alive?</strong> ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#initialize-instance_method" title="#new (instance method)">#<strong>new</strong> { ... } ⇒ Object </a>
</span>
<span class="note title constructor">constructor</span>
<span class="summary_desc"><div class='inline'><p>Creates a fiber, whose execution is suspend until it is explicitly resumed using <code>Fiber#resume</code> method.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#resume-instance_method" title="#resume (instance method)">#<strong>resume</strong>(args, ...) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'><p>Resumes the fiber from the point at which the last <code>Fiber.yield</code> was called, or starts running it if it is the first call to <code>resume</code>.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#transfer-instance_method" title="#transfer (instance method)">#<strong>transfer</strong>(args, ...) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'><p>Transfers control to receiver fiber of the method call.</p>
</div></span>
</li>
</ul>
<div id="constructor_details" class="method_details_list">
<h2>Constructor Details</h2>
<div class="method_details first">
<h3 class="signature first" id="initialize-instance_method">
#<strong>new</strong> { ... } ⇒ <tt>Object</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Creates a fiber, whose execution is suspend until it is explicitly
resumed using <code>Fiber#resume</code> method.
The code running inside the fiber can give up control by calling
<code>Fiber.yield</code> in which case it yields control back to caller
(the caller of the <code>Fiber#resume</code>).</p>
<p>Upon yielding or termination the Fiber returns the value of the last
executed expression</p>
<p>For instance:</p>
<p>fiber = Fiber.new do
Fiber.yield 1
2
end</p>
<p>puts fiber.resume
puts fiber.resume
puts fiber.resume</p>
<p><em>produces</em></p>
<p>1
2
resuming dead fiber (FiberError)</p>
<p>The <code>Fiber#resume</code> method accepts an arbitrary number of
parameters, if it is the first call to <code>resume</code> then they
will be passed as block arguments. Otherwise they will be the return
value of the call to <code>Fiber.yield</code></p>
<p>Example:</p>
<p>fiber = Fiber.new do |first|
second = Fiber.yield first + 2
end</p>
<p>puts fiber.resume 10
puts fiber.resume 14
puts fiber.resume 18</p>
<p><em>produces</em></p>
<p>12
14
resuming dead fiber (FiberError)</p>
</div>
</div>
<div class="tags">
<div class="docstring">
<div class="discussion">
</div>
</div>
<div class="tags">
<p class="tag_title">Yields:</p>
<ul class="yield">
<li>
<span class='type'></span>
<div class='inline'><p>[]</p>
</div>
</li>
</ul>
</div>
</div>
<table class="source_code">
<tr>
<td>
<pre class="lines">
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</td>
<td>
<pre class="code"><span class="info file"># File 'mrbgems/mruby-fiber/src/fiber.c', line 64</span>
static mrb_value
fiber_init(mrb_state *mrb, mrb_value <span style="color:#069">self</span>)
{
static const struct mrb_context mrb_context_zero = { <span style="color:#00D">0</span> };
struct <span style="color:#036;font-weight:bold">RFiber</span> *f = fiber_ptr(<span style="color:#069">self</span>);
struct mrb_context *c;
struct <span style="color:#036;font-weight:bold">RProc</span> *p;
mrb_callinfo *ci;
mrb_value blk;
size_t slen;
mrb_get_args(mrb, <span style="background-color:hsla(0,100%,50%,0.05)"><span style="color:#710">"</span><span style="color:#D20">&!</span><span style="color:#710">"</span></span>, &blk);
<span style="color:#080;font-weight:bold">if</span> (f->cxt) {
mrb_raise(mrb, <span style="color:#036;font-weight:bold">E_RUNTIME_ERROR</span>, <span style="background-color:hsla(0,100%,50%,0.05)"><span style="color:#710">"</span><span style="color:#D20">cannot initialize twice</span><span style="color:#710">"</span></span>);
}
p = mrb_proc_ptr(blk);
<span style="color:#080;font-weight:bold">if</span> (MRB_PROC_CFUNC_P(p)) {
mrb_raise(mrb, <span style="color:#036;font-weight:bold">E_FIBER_ERROR</span>, <span style="background-color:hsla(0,100%,50%,0.05)"><span style="color:#710">"</span><span style="color:#D20">tried to create Fiber from C defined method</span><span style="color:#710">"</span></span>);
}
c = (struct mrb_context*)mrb_malloc(mrb, sizeof(struct mrb_context));
*c = mrb_context_zero;
f->cxt = c;
<span style="background-color:hsla(300,100%,50%,0.06)"><span style="color:#404">/</span><span style="color:#808">* initialize VM stack *</span><span style="color:#404">/</span></span>
slen = <span style="color:#036;font-weight:bold">FIBER_STACK_INIT_SIZE</span>;
<span style="color:#080;font-weight:bold">if</span> (p->body.irep->nregs > slen) {
slen += p->body.irep->nregs;
}
c->stbase = (mrb_value *)mrb_malloc(mrb, slen*sizeof(mrb_value));
c->stend = c->stbase + slen;
c->stack = c->stbase;
<span style="color:#777">#ifdef MRB_NAN_BOXING</span>
{
mrb_value *p = c->stbase;
mrb_value *pend = c->stend;
<span style="color:#080;font-weight:bold">while</span> (p < pend) {
SET_NIL_VALUE(*p);
p++;
}
}
<span style="color:#777">#else</span>
memset(c->stbase, <span style="color:#00D">0</span>, slen * sizeof(mrb_value));
<span style="color:#777">#endif</span>
<span style="background-color:hsla(300,100%,50%,0.06)"><span style="color:#404">/</span><span style="color:#808">* copy receiver from a block *</span><span style="color:#404">/</span></span>
c->stack[<span style="color:#00D">0</span>] = mrb->c->stack[<span style="color:#00D">0</span>];
<span style="background-color:hsla(300,100%,50%,0.06)"><span style="color:#404">/</span><span style="color:#808">* initialize callinfo stack *</span><span style="color:#404">/</span></span>
c->cibase = (mrb_callinfo *)mrb_calloc(mrb, <span style="color:#036;font-weight:bold">FIBER_CI_INIT_SIZE</span>, sizeof(mrb_callinfo));
c->ciend = c->cibase + <span style="color:#036;font-weight:bold">FIBER_CI_INIT_SIZE</span>;
c->ci = c->cibase;
c->ci->stackent = c->stack;
<span style="background-color:hsla(300,100%,50%,0.06)"><span style="color:#404">/</span><span style="color:#808">* adjust return callinfo *</span><span style="color:#404">/</span></span>
ci = c->ci;
ci->target_class = MRB_PROC_TARGET_CLASS(p);
ci->proc = p;
mrb_field_write_barrier(mrb, (struct <span style="color:#036;font-weight:bold">RBasic</span>*)mrb_obj_ptr(<span style="color:#069">self</span>), (struct <span style="color:#036;font-weight:bold">RBasic</span>*)p);
ci->pc = p->body.irep->iseq;
ci[<span style="color:#00D">1</span>] = ci[<span style="color:#00D">0</span>];
c->ci++; <span style="background-color:hsla(300,100%,50%,0.06)"><span style="color:#404">/</span><span style="color:#808">* push dummy callinfo *</span><span style="color:#404">/</span></span>
c->fib = f;
c->status = <span style="color:#036;font-weight:bold">MRB_FIBER_CREATED</span>;
<span style="color:#080;font-weight:bold">return</span> <span style="color:#069">self</span>;
}</pre>
</td>
</tr>
</table>
</div>
</div>
<div id="instance_method_details" class="method_details_list">
<h2>Instance Method Details</h2>
<div class="method_details first">
<h3 class="signature first" id="==-instance_method">
#<strong>==</strong> ⇒ <tt>Object</tt>
</h3><table class="source_code">
<tr>
<td>
<pre class="lines">
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</td>
<td>
<pre class="code"><span class="info file"># File 'mrbgems/mruby-fiber/src/fiber.c', line 291</span>
static mrb_value
fiber_eq(mrb_state *mrb, mrb_value <span style="color:#069">self</span>)
{
mrb_value other;
mrb_get_args(mrb, <span style="background-color:hsla(0,100%,50%,0.05)"><span style="color:#710">"</span><span style="color:#D20">o</span><span style="color:#710">"</span></span>, &other);
<span style="color:#080;font-weight:bold">if</span> (!mrb_fiber_p(other)) {
<span style="color:#080;font-weight:bold">return</span> mrb_false_value();
}
<span style="color:#080;font-weight:bold">return</span> mrb_bool_value(fiber_ptr(<span style="color:#069">self</span>) == fiber_ptr(other));
}</pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="alive?-instance_method">
#<strong>alive?</strong> ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
</li>
</ul>
</div>
</div>
<div class="method_details ">
<h3 class="signature " id="resume-instance_method">
#<strong>resume</strong>(args, ...) ⇒ <tt>Object</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Resumes the fiber from the point at which the last <code>Fiber.yield</code>
was called, or starts running it if it is the first call to
<code>resume</code>. Arguments passed to resume will be the value of
the <code>Fiber.yield</code> expression or will be passed as block
parameters to the fiber’s block if this is the first <code>resume</code>.</p>
<p>Alternatively, when resume is called it evaluates to the arguments passed
to the next <code>Fiber.yield</code> statement inside the fiber’s block
or to the block value if it runs to completion without any
<code>Fiber.yield</code></p>
</div>
</div>
<div class="tags">
<div class="docstring">
<div class="discussion">
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Object</tt>)</span>
</li>
</ul>
</div>
</div>
<table class="source_code">
<tr>
<td>
<pre class="lines">
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267</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'mrbgems/mruby-fiber/src/fiber.c', line 255</span>
static mrb_value
fiber_resume(mrb_state *mrb, mrb_value <span style="color:#069">self</span>)
{
mrb_value *a;
mrb_int len;
mrb_bool vmexec = <span style="color:#069">FALSE</span>;
mrb_get_args(mrb, <span style="background-color:hsla(0,100%,50%,0.05)"><span style="color:#710">"</span><span style="color:#D20">*!</span><span style="color:#710">"</span></span>, &a, &len);
<span style="color:#080;font-weight:bold">if</span> (mrb->c->ci->acc < <span style="color:#00D">0</span>) {
vmexec = <span style="color:#069">TRUE</span>;
}
<span style="color:#080;font-weight:bold">return</span> fiber_switch(mrb, <span style="color:#069">self</span>, len, a, <span style="color:#069">TRUE</span>, vmexec);
}</pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="transfer-instance_method">
#<strong>transfer</strong>(args, ...) ⇒ <tt>Object</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Transfers control to receiver fiber of the method call.
Unlike <code>resume</code> the receiver wouldn’t be pushed to call
stack of fibers. Instead it will switch to the call stack of
transferring fiber.
When resuming a fiber that was transferred to another fiber it would
cause double resume error. Though when the fiber is re-transferred
and <code>Fiber.yield</code> is called, the fiber would be resumable.</p>
</div>
</div>
<div class="tags">
<div class="docstring">
<div class="discussion">
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Object</tt>)</span>
</li>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-fiber/src/fiber.c', line 315</span>
static mrb_value
fiber_transfer(mrb_state *mrb, mrb_value <span style="color:#069">self</span>)
{
struct mrb_context *c = fiber_check(mrb, <span style="color:#069">self</span>);
mrb_value* a;
mrb_int len;
fiber_check_cfunc(mrb, mrb->c);
mrb_get_args(mrb, <span style="background-color:hsla(0,100%,50%,0.05)"><span style="color:#710">"</span><span style="color:#D20">*!</span><span style="color:#710">"</span></span>, &a, &len);
<span style="color:#080;font-weight:bold">if</span> (c == mrb->root_c) {
mrb->c->status = <span style="color:#036;font-weight:bold">MRB_FIBER_TRANSFERRED</span>;
fiber_switch_context(mrb, c);
MARK_CONTEXT_MODIFY(c);
<span style="color:#080;font-weight:bold">return</span> fiber_result(mrb, a, len);
}
<span style="color:#080;font-weight:bold">if</span> (c == mrb->c) {
<span style="color:#080;font-weight:bold">return</span> fiber_result(mrb, a, len);
}
<span style="color:#080;font-weight:bold">return</span> fiber_switch(mrb, <span style="color:#069">self</span>, len, a, <span style="color:#069">FALSE</span>, <span style="color:#069">FALSE</span>);
}</pre>
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Generated on Wed Nov 27 22:35:11 2019 by
<a href="http://yardoc.org" title="Yay! A Ruby Documentation Tool" target="_parent">yard</a>
0.9.20 in <a href="https://github.com/sagmor/yard-mruby">mruby mode</a> 0.3.0 (ruby-2.5.5).
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