Reference counting in UnicodeString
"Brown, Brooks" <[email protected]> Fri, 10 Dec 2004 12:35:26 -0800
| Newsgroups | gmane.comp.lib.icu.general |
|---|---|
| Message-ID | <[email protected]> |
This is a multi-part message in MIME format. ------_=_NextPart_001_01C4DEF7.C7AE533E Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable We are considering using ICU's UnicodeString as a cross platform string = class. (The platforms we need to support are MacOS 10.2.8 and Windows = 2000 or better.) The UnicodeString class has many features we want, but = I am concerned about the use of pthread_mutex_lock on non-Windows = platforms for safe reference counting. Is the optimization of sharing buffers for string data really worth all = the thread synchronization that can occur? Normally, when you copy a = string, you modify it in the next statement, so you need to allocate a = new buffer and copy anyway. Should there be a compiler option to disable the behind-the-scenes = sharing of buffers between strings? (Excluding read only aliases, since = those aren't reference counted.) Brooks R. Brown Software Engineer Extensis, Inc. <http://www.extensis.com/> phone: 503.274.2020 x130 email: [email protected] Empowering digital assets Notice: This communication may contain privileged or other confidential = information. If you are not the intended recipient, or believe that you = have received this communication in error, please do not print, copy, = retransmit, disseminate, or otherwise use the information. Also, please = indicate to the sender that you have received this email in error, and = delete the copy you received. Thank you. ------_=_NextPart_001_01C4DEF7.C7AE533E Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; = charset=3Diso-8859-1"> <META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version = 6.5.7226.0"> <TITLE>Reference counting in UnicodeString</TITLE> </HEAD> <BODY> <!-- Converted from text/rtf format --> <P><FONT SIZE=3D2 FACE=3D"Arial">We are considering using ICU's = UnicodeString as a cross platform string class. (The platforms we = need to support are MacOS 10.2.8 and Windows 2000 or better.) The = UnicodeString class has many features we want, but I am concerned = about</FONT> <FONT SIZE=3D2 FACE=3D"Arial">the use of pthread_mutex_lock = on</FONT> <FONT SIZE=3D2 FACE=3D"Arial">non-Windows platforms for safe = reference counting.</FONT></P> <P><FONT SIZE=3D2 FACE=3D"Arial">Is the optimization of sharing buffers = for string data really worth all the thread synchronization that can = occur? Normally, when you copy a string, you modify it in the next = statement, so you need to allocate a new buffer and copy = anyway.</FONT></P> <P><FONT SIZE=3D2 FACE=3D"Arial">Should there be a compiler option to = disable the behind-the-scenes sharing of buffers between strings? = (Excluding read only aliases, since those aren't reference = counted.)</FONT></P> <P><B><FONT SIZE=3D2 FACE=3D"Arial">Brooks R. Brown</FONT></B> <BR><FONT COLOR=3D"#999999" SIZE=3D2 FACE=3D"Arial">Software = Engineer</FONT> <BR><FONT COLOR=3D"#999999" SIZE=3D2 FACE=3D"Arial">Extensis, = Inc.</FONT> <BR><FONT COLOR=3D"#999999" SIZE=3D2 FACE=3D"Arial"><<A = HREF=3D"http://www.extensis.com/">http://www.extensis.com/</A>></FONT>= <BR><FONT COLOR=3D"#999999" SIZE=3D2 FACE=3D"Arial">phone: 503.274.2020 = x130</FONT> <BR><FONT COLOR=3D"#999999" SIZE=3D2 FACE=3D"Arial">email: = [email protected]</FONT> </P> <P><FONT COLOR=3D"#FF0000" SIZE=3D2 FACE=3D"Arial">Empowering digital = assets</FONT> </P> <P><SPAN LANG=3D"en-us"><FONT COLOR=3D"#808080" SIZE=3D1 = FACE=3D"Arial">Notice: This communication may contain privileged = or other confidential information. If you are not the intended = recipient, or believe that you have received this communication in = error, please do not print, copy, retransmit, disseminate, or otherwise = use the information. Also, please indicate to the sender that you = have received this email in error, and delete the copy you = received. Thank you.</FONT></SPAN><SPAN = LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN = LANG=3D"en-us"></SPAN></P> <BR> </BODY> </HTML> ------_=_NextPart_001_01C4DEF7.C7AE533E--