mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH v2 1/4] bthread: implement basic Linux-like completion API
Date: Fri, 30 Apr 2021 15:40:58 +0200	[thread overview]
Message-ID: <20210430134101.20580-2-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20210430134101.20580-1-a.fatoum@pengutronix.de>

So far, completions made sense only in one direction: The main thread
can wait for pollers, but the other way around didn't work. With the new
bthread support, any bthread can wait for another to complete().
Wrap this up using the Linux completion API to make porting threaded
code easier.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 include/linux/completion.h | 55 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 include/linux/completion.h

diff --git a/include/linux/completion.h b/include/linux/completion.h
new file mode 100644
index 000000000000..e897e4f65b8b
--- /dev/null
+++ b/include/linux/completion.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * (C) Copyright 2021 Ahmad Fatoum
+ *
+ * Async wait-for-completion handler data structures.
+ * This allows one bthread to wait for another
+ */
+
+#ifndef __LINUX_COMPLETION_H
+#define __LINUX_COMPLETION_H
+
+#include <stdio.h>
+#include <errno.h>
+#include <bthread.h>
+
+struct completion {
+	unsigned int done;
+};
+
+static inline void init_completion(struct completion *x)
+{
+	x->done = 0;
+}
+
+static inline void reinit_completion(struct completion *x)
+{
+	x->done = 0;
+}
+
+static inline int wait_for_completion_interruptible(struct completion *x)
+{
+	while (!x->done) {
+		switch (bthread_should_stop()) {
+		case -EINTR:
+			if (!ctrlc())
+				continue;
+		case 1:
+			return -ERESTARTSYS;
+		}
+	}
+
+	return 0;
+}
+
+static inline bool completion_done(struct completion *x)
+{
+	return x->done;
+}
+
+static inline void complete(struct completion *x)
+{
+	x->done = 1;
+}
+
+#endif
-- 
2.29.2


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox


  reply	other threads:[~2021-04-30 13:42 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-30 13:40 [PATCH v2 0/4] usbgadget: add support for USB mass storage gadget Ahmad Fatoum
2021-04-30 13:40 ` Ahmad Fatoum [this message]
2021-04-30 13:40 ` [PATCH v2 2/4] slice: reschedule bthreads doing File I/O in command context Ahmad Fatoum
2021-04-30 13:41 ` [PATCH v2 3/4] usbgadget: refactor usbgadget_register to accept array Ahmad Fatoum
2021-04-30 13:41 ` [PATCH v2 4/4] usbgadget: add support for USB mass storage gadget Ahmad Fatoum

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210430134101.20580-2-a.fatoum@pengutronix.de \
    --to=a.fatoum@pengutronix.de \
    --cc=barebox@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox