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Improve handling of pthread_mutex_lock error case

We should really be reporting a useful error along with returninga valid return code if pthread_mutex_lock() throws an error forsome reason. Add that and back-patch to 9.0 as the prior patch.Pointed out by Alvaro Herrera

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src/interfaces/libpq
- fe-secure.c

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+13

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`‎src/interfaces/libpq/fe-secure.c‎`

Lines changed: 13 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -262,7 +262,11 @@ pqsecure_open_client(PGconn *conn)`
`262`	`262`
`263`	`263`	`#ifdefENABLE_THREAD_SAFETY`
`264`	`264`	`if (pthread_mutex_lock(&ssl_config_mutex))`
`265`		`-return-1;`
	`265`	`+{`
	`266`	`+printfPQExpBuffer(&conn->errorMessage,`
	`267`	`+libpq_gettext("unable to acquire mutex\n"));`
	`268`	`+returnPGRES_POLLING_FAILED;`
	`269`	`+}`
`266`	`270`	`#endif`
`267`	`271`	`/* Create a connection-specific SSL object */`
`268`	`272`	`if (!(conn->ssl=SSL_new(SSL_context))\|\|`
`@@ -1111,7 +1115,11 @@ initialize_SSL(PGconn *conn)`
`1111`	`1115`	`*/`
`1112`	`1116`	`#ifdefENABLE_THREAD_SAFETY`
`1113`	`1117`	`if (pthread_mutex_lock(&ssl_config_mutex))`
	`1118`	`+{`
	`1119`	`+printfPQExpBuffer(&conn->errorMessage,`
	`1120`	`+libpq_gettext("unable to acquire mutex\n"));`
`1114`	`1121`	`return-1;`
	`1122`	`+}`
`1115`	`1123`	`#endif`
`1116`	`1124`	`if (SSL_CTX_use_certificate_chain_file(SSL_context,fnbuf)!=1)`
`1117`	`1125`	`{`
`@@ -1325,7 +1333,11 @@ initialize_SSL(PGconn *conn)`
`1325`	`1333`
`1326`	`1334`	`#ifdefENABLE_THREAD_SAFETY`
`1327`	`1335`	`if (pthread_mutex_lock(&ssl_config_mutex))`
	`1336`	`+{`
	`1337`	`+printfPQExpBuffer(&conn->errorMessage,`
	`1338`	`+libpq_gettext("unable to acquire mutex\n"));`
`1328`	`1339`	`return-1;`
	`1340`	`+}`
`1329`	`1341`	`#endif`
`1330`	`1342`	`if (SSL_CTX_load_verify_locations(SSL_context,fnbuf,NULL)!=1)`
`1331`	`1343`	`{`

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Commit7112775

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`‎src/interfaces/libpq/fe-secure.c‎`

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