mraa: Add patch to fix "uv__has_active_reqs" assertions

See the included patch for more details. Related mraa PR is
eclipse/mraa#1102.

Fixes #386

Signed-off-by: Jan Kiszka <[email protected]>

recipes-app/mraa/files/0001-gpio-Fix-JS-binding-regarding-interrupt-injections.patch

@@ -0,0 +1,138 @@
+From b10341fae399f8c25887c348af9577640b1e233e Mon Sep 17 00:00:00 2001
+From: Jan Kiszka <[email protected]>
+Date: Mon, 5 Dec 2022 11:45:15 +0100
+Subject: [PATCH] gpio: Fix JS binding regarding interrupt injections
+
+According to [1] and based on stress tests, it is not correct to call
+uv_queue_work outside of the loop thread. We rather need to use the
+async API of libuv. That even simplifies things.
+
+Resolves "uv__queue_done: Assertion `uv__has_active_reqs(req->loop)' failed"
+errors that were easy to trigger by multiple DIs being used in parallel.
+See also [2].
+
+[1] https://github.com/libuv/libuv/discussions/3847
+[2] https://github.com/siemens/meta-iot2050/issues/386
+
+Signed-off-by: Jan Kiszka <[email protected]>
+---
+ api/mraa/gpio.hpp | 37 +++++++++++++++++++++----------------
+ 1 file changed, 21 insertions(+), 16 deletions(-)
+
+diff --git a/api/mraa/gpio.hpp b/api/mraa/gpio.hpp
+index 8fc0881..c41d527 100644
+--- a/api/mraa/gpio.hpp
++++ b/api/mraa/gpio.hpp
+@@ -31,10 +31,10 @@
+ #include <stdexcept>
+
+ #if defined(SWIGJAVASCRIPT)
+-#if NODE_MODULE_VERSION >= 0x000D
+ #include <uv.h>
+ #endif
+-#endif
++
++#define container_of(ptr, type, member) ((type*) ((char*) (ptr) - offsetof(type, member)))
+
+ namespace mraa
+ {
+@@ -124,6 +124,10 @@ class Gpio
+         if (!owner) {
+             mraa_gpio_owner(m_gpio, 0);
+         }
++
++#if defined(SWIGJAVASCRIPT)
++        uv_async_init(uv_default_loop(), &m_async, v8isr);
++#endif
+     }
+     /**
+      * Gpio Constructor, takes a pointer to the GPIO context and initialises
+@@ -137,6 +141,9 @@ class Gpio
+         if (m_gpio == NULL) {
+             throw std::invalid_argument("Invalid GPIO context");
+         }
++#if defined(SWIGJAVASCRIPT)
++        uv_async_init(uv_default_loop(), &m_async, v8isr);
++#endif
+     }
+     /**
+      * Gpio object destructor, this will only unexport the gpio if we where
+@@ -146,6 +153,9 @@ class Gpio
+     {
+         if (m_gpio != NULL) {
+             mraa_gpio_close(m_gpio);
++#if defined(SWIGJAVASCRIPT)
++            uv_close((uv_handle_t*) &m_async, NULL);
++#endif
+         }
+     }
+     /**
+@@ -156,6 +166,9 @@ class Gpio
+     {
+         mraa_gpio_close(m_gpio);
+         m_gpio = NULL;
++#if defined(SWIGJAVASCRIPT)
++        uv_close((uv_handle_t*) &m_async, NULL);
++#endif
+     }
+     /**
+      * Set the edge mode for ISR
+@@ -176,12 +189,12 @@ class Gpio
+     }
+ #elif defined(SWIGJAVASCRIPT)
+     static void
+-    v8isr(uv_work_t* req, int status)
++    v8isr(uv_async_t* async)
+     {
+ #if NODE_MODULE_VERSION >= 0x000D
+         v8::HandleScope scope(v8::Isolate::GetCurrent());
+ #endif
+-        mraa::Gpio* This = (mraa::Gpio*) req->data;
++        mraa::Gpio* This = container_of(async, mraa::Gpio, m_async);
+         int argc = 1;
+         v8::Local<v8::Value> argv[] = { SWIGV8_INTEGER_NEW(-1) };
+ #if NODE_MODULE_VERSION >= 0x000D
+@@ -194,21 +207,12 @@ class Gpio
+ #else
+         This->m_v8isr->Call(SWIGV8_CURRENT_CONTEXT()->Global(), argc, argv);
+ #endif
+-        delete req;
+-    }
+-
+-    static void
+-    nop(uv_work_t* req)
+-    {
+-        // Do nothing.
+     }
+
+     static void
+-    uvwork(void* ctx)
++    trigger_async(void* async)
+     {
+-        uv_work_t* req = new uv_work_t;
+-        req->data = ctx;
+-        uv_queue_work(uv_default_loop(), req, nop, v8isr);
++        uv_async_send((uv_async_t*) async);
+     }
+
+     Result
+@@ -219,7 +223,7 @@ class Gpio
+ #else
+         m_v8isr = v8::Persistent<v8::Function>::New(func);
+ #endif
+-        return (Result) mraa_gpio_isr(m_gpio, (mraa_gpio_edge_t) mode, &uvwork, this);
++        return (Result) mraa_gpio_isr(m_gpio, (mraa_gpio_edge_t) mode, trigger_async, &m_async);
+     }
+ #elif defined(SWIGJAVA) || defined(JAVACALLBACK)
+     Result
+@@ -376,6 +380,7 @@ class Gpio
+   private:
+     mraa_gpio_context m_gpio;
+ #if defined(SWIGJAVASCRIPT)
++    uv_async_t m_async;
+     v8::Persistent<v8::Function> m_v8isr;
+ #endif
+ };
+-- 
+2.35.3
+

recipes-app/mraa/mraa_2.2.0+git.bb

@@ -12,6 +12,7 @@ inherit dpkg
 DESCRIPTION = "Low Level Skeleton Library for Communication on GNU/Linux platforms"
 MAINTAINER = "[email protected]"
 SRC_URI += "git://github.com/eclipse/mraa.git;protocol=https \
+            file://0001-gpio-Fix-JS-binding-regarding-interrupt-injections.patch \
             file://rules"
 SRCREV = "8b1c54934e80edc2d36abac9d9c96fe1e01cb669"