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WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200220143841.GL4679@Air-de-Roger> Content-Language: en-US Subject: Re: [Xen-devel] [PATCH] rwlock: allow recursive read locking when already locked in write mode X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= , Stefano Stabellini , Julien Grall , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , xen-devel@lists.xenproject.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" T24gMjAuMDIuMjAyMCAxNTozOCwgUm9nZXIgUGF1IE1vbm7DqSB3cm90ZToKPiBPbiBUaHUsIEZl YiAyMCwgMjAyMCBhdCAwMzoyMzozOFBNICswMTAwLCBKw7xyZ2VuIEdyb8OfIHdyb3RlOgo+PiBP biAyMC4wMi4yMCAxNToxMSwgUm9nZXIgUGF1IE1vbm7DqSB3cm90ZToKPj4+IE9uIFRodSwgRmVi IDIwLCAyMDIwIGF0IDAxOjQ4OjU0UE0gKzAxMDAsIEphbiBCZXVsaWNoIHdyb3RlOgo+Pj4+IE9u IDIwLjAyLjIwMjAgMTM6MDIsIFJvZ2VyIFBhdSBNb25uZSB3cm90ZToKPj4+Pj4gQEAgLTE2Niw3 ICsxODAsOCBAQCBzdGF0aWMgaW5saW5lIHZvaWQgX3dyaXRlX3VubG9jayhyd2xvY2tfdCAqbG9j aykKPj4+Pj4gICAgICAgICogSWYgdGhlIHdyaXRlciBmaWVsZCBpcyBhdG9taWMsIGl0IGNhbiBi ZSBjbGVhcmVkIGRpcmVjdGx5Lgo+Pj4+PiAgICAgICAgKiBPdGhlcndpc2UsIGFuIGF0b21pYyBz dWJ0cmFjdGlvbiB3aWxsIGJlIHVzZWQgdG8gY2xlYXIgaXQuCj4+Pj4+ICAgICAgICAqLwo+Pj4+ PiAtICAgIGF0b21pY19zdWIoX1FXX0xPQ0tFRCwgJmxvY2stPmNudHMpOwo+Pj4+PiArICAgIEFT U0VSVChfaXNfd3JpdGVfbG9ja2VkX2J5X21lKGF0b21pY19yZWFkKCZsb2NrLT5jbnRzKSkpOwo+ Pj4+PiArICAgIGF0b21pY19zdWIoX3dyaXRlX2xvY2tfdmFsKCksICZsb2NrLT5jbnRzKTsKPj4+ Pgo+Pj4+IEkgdGhpbmsgdGhpcyB3b3VsZCBiZSBtb3JlIGVmZmljaWVudCB3aXRoIGF0b21pY19h bmQoKSwgbm90Cj4+Pj4gdGhlIGxlYXN0IGJlY2F1c2Ugb2YgdGhlIHRoZW4gYXZvaWRlZCBzbXBf cHJvY2Vzc29yX2lkKCkuCj4+Pj4gV2hldGhlciB0byBtYXNrIG9mZiBqdXN0IF9RV19XTUFTSyBv ciBhbHNvIHRoZSBDUFUgbnVtYmVyIG9mCj4+Pj4gdGhlIGxhc3Qgd3JpdGUgb3duZXIgd291bGQg bmVlZCB0byBiZSBkZXRlcm1pbmVkLiBCdXQgd2l0aAo+Pj4+IHVzaW5nIHN1YnRyYWN0aW9uLCBp biBjYXNlIG9mIHByb2JsZW1zIGl0J2xsIGxpa2VseSBiZQo+Pj4+IGhhcmRlciB0byB1bmRlcnN0 YW5kIHdoYXQgYWN0dWFsbHkgd2VudCBvbiwgZnJvbSBsb29raW5nIGF0Cj4+Pj4gdGhlIHJlc3Vs dGluZyBzdGF0ZSBvZiB0aGUgbG9jayAodGhpcyBpcyBpbiBwYXJ0IGEgcHJlLQo+Pj4+IGV4aXN0 aW5nIHByb2JsZW0sIGJ1dCBnZXRzIHdvcnNlIHdpdGggc3VidHJhY3Rpb24gb2YgQ1BVCj4+Pj4g bnVtYmVycykuCj4+Pgo+Pj4gUmlnaHQsIGEgbWFzayB3b3VsZCBiZSBiZXR0ZXIuIFJpZ2h0IG5v dyBib3RoIG5lZWQgdG8gYmUgY2xlYXJlZCAodGhlCj4+PiBMT0NLRUQgYW5kIHRoZSBDUFUgZmll bGRzKSBhcyB0aGVyZSdzIGNvZGUgdGhhdCByZWxpZXMgb24gIWxvY2stPmNudHMKPj4+IGFzIGEg d2F5IHRvIGRldGVybWluZSB0aGF0IHRoZSBsb2NrIGlzIG5vdCByZWFkIG9yIHdyaXRlIGxvY2tl ZC4gSWYgd2UKPj4+IGxlZnQgdGhlIENQVSBseWluZyBhcm91bmQgdGhvc2UgY2hlY2tzIHdvdWxk IG5lZWQgdG8gYmUgYWRqdXN0ZWQuCj4+Cj4+IEluIGNhc2UgeW91IG1ha2UgX1FSX1NISUZUIDE2 IGl0IGlzIHBvc3NpYmxlIHRvIGp1c3Qgd3JpdGUgYSAyLWJ5dGUgemVybwo+PiB2YWx1ZSBmb3Ig d3JpdGVfdW5sb2NrKCkgKGxpa2UgaXRzIHBvc3NpYmxlIHRvIGRvIHNvIHRvZGF5IHVzaW5nIGEK Pj4gc2luZ2xlIGJ5dGUgd3JpdGUpLgo+IAo+IFRoYXQgd291bGQgbGltaXQgdGhlIHJlYWRlcnMg Y291bnQgdG8gNjU1MzYsIHdoYXQgZG8geW91IHRoaW5rIEphbj8KCklmIHRoZSByZWN1cnNlX2Nw dSBhcHByb2FjaCBpcyBjb25zaWRlcmVkIGJhZCwgSSB0aGluayB0aGlzIHdvdWxkCmJlIGFjY2Vw dGFibGUuIEJ1dCBvZiBjb3Vyc2UgeW91J2xsIG5lZWQgdG8gY29uc3VsdCB3aXRoIHRoZSBBcm0K Z3V5cyByZWdhcmRpbmcgdGhlIGNvcnJlY3RuZXNzIG9mIHN1Y2ggYSAiaGFsZiIgc3RvcmUgaW4g dGhlaXIKbWVtb3J5IG1vZGVsOyBJIHdvdWxkIGhvcGUgdGhpcyB0byBiZSB1bml2ZXJzYWxseSBv a2F5LCBidXQgSSdtCm5vdCBlbnRpcmVseSBjZXJ0YWluLgoKSmFuCgpfX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhl bi1kZXZlbEBsaXN0cy54ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3Jn L21haWxtYW4vbGlzdGluZm8veGVuLWRldmVs